200 Allied The Leading Mathematics 1 Theme IV Our School 201 ADDITION UP TO 100 WITHOUT CARRY OVER Chapter 11 Lessons Pages 11.1 Addition of 2-digit and 1-digit Numbers 202 11.2 Addition of 2-digit Numbers 203 11.3 Addition of Three Numbers 204 11.4 Word Problems on Addition up to Three Numbers 206 Maths is Everywhere 207 Project Work – 11 207 v How many children are looking fishes in the pond? v How many fishes are there in the ponds (i), (ii) and (iii) ? v How many total fishes are there in the ponds (i) and (ii) ? v How many total fishes are there in the ponds (ii) and (iii) ? Warm-Up v Add two numerals without carry over having the sum up to 100. Learning Outcomes: Instruction: Teachers are requested to discuss with students by asking more questions. Pond (i) Pond (ii) Pond (iii)
202 Allied The Leading Mathematics 1 Theme IV Our School 203 + = Add Tens Add Ones T O 1 + 3 4 1 7 1. Add the following. 2. Add the following. + = + = T O 1 + 4 2 T O 2 + 2 3 + = + = T O 3 + 0 6 T O 2 + 5 4 a. 2 0 + 3 b. 3 4 + 3 c. 5 4 + 5 d. 6 5 + 0 e. 2 0 + 9 f. 6 8 + 1 g. 7 2 + 7 h. 8 2 + 6 i. 9 1 + 7 j. 9 3 + 6 3. Write the numbers and add. a. 3 tens + 5 ones = ........... b. 7 tens + 7 ones = ........... c. 8 tens + 6 ones = ........... d. 5 tens + 9 ones = ........... Look, Think and Tell Sapana has 13 blocks. If her friend gives 4 blocks to her, how many blocks does she have now? How can we find it? For this, we add 13 and 4. i.e. 13 + 4 = ? 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 Look, Think and Do 13 17 4 11.1 Addition of 2-digit Number with 1-digit Numbers
202 Allied The Leading Mathematics 1 Theme IV Our School 203 Add. a. T O 2 2 + 1 7 b. T O 4 8 + 3 1 c. T O 2 1 + 1 8 d. T O 2 5 + 1 4 e. T O 3 5 + 2 4 f. T O 3 6 + 2 2 g. T O 6 1 + 3 7 h. T O 7 4 + 1 4 i. T O 5 3 + 4 2 j. T O 4 5 + 1 4 k. T O 2 1 + 7 8 l. T O 5 1 + 1 7 m. T O 7 2 + 2 6 n. T O 3 6 + 6 1 o. T O 3 3 + 1 5 Look, Think and Tell T O 5 + 3 5 2 8 7 + = There are 55 pieces of blocks with Jonson and 32 pieces of blocks with Ali. How many pieces of blocks are there altogether? How can we find the total pieces of blocks ? For this we add 55 and 32. i.e. 55 + 32 = ? Add Tens Add Ones Look, Think and Do 11.2 Addition of 2-digit Numbers
204 Allied The Leading Mathematics 1 Theme IV Our School 205 + + = Add Ones Add Tens 2 4 2 2 + 1 3 T O 2 2 + 1 4 2 3 9 T O 2 2 + 1 4 2 3 5 9 Add. a. T O 1 4 2 1 + 1 2 b. T O 2 4 1 3 + 1 2 c. T O 5 1 2 5 + 1 2 d. T O 4 3 1 5 + 2 1 e. T O 6 4 1 1 + 2 1 f. T O 4 6 1 1 + 1 2 g. T O 3 4 5 1 + 1 3 h. T O 2 2 3 3 + 1 2 i. T O 1 3 1 3 + 1 3 j. T O 1 1 4 6 + 3 2 Look, Think and Tell There are 24 blocks with Gopal, 22 blocks with Gita and 13 blocks with Goma. How many total blocks are there in all? Look, Think and Do 11.3 Addition of Three Numbers
204 Allied The Leading Mathematics 1 Theme IV Our School 205 1. Add the followings. 2. Add the following. a. T O 1 3 1 2 + 1 4 b. T O 2 3 2 2 + 2 1 c. T O 4 3 1 4 + 2 2 d. T O 5 2 5 4 + 1 2 e. T O 4 6 2 1 + 1 2 f. T O 3 5 2 2 + 3 2 g. T O 4 2 2 6 + 2 1 h. T O 3 4 5 2 + 1 1 i. T O 2 1 5 5 + 2 3 j. T O 5 1 1 5 + 2 2 k. T O 3 4 1 2 + 2 1 l. T O 1 2 4 5 + 1 m. T O 5 4 4 3 + 2 n. T O 6 2 3 + 4 o. T O 3 1 2 + 4 a. T O 1 2 + 3 6 b. T O 6 2 + 1 3 c. T O 2 3 + 4 6 d. T O 3 4 + 1 3 e. T O 2 6 + 1 2 f. T O 2 1 + 7 8 g. T O 5 1 + 1 7 h. T O 7 2 + 1 7 i. T O 3 6 + 6 3 j. T O 3 3 + 1 5 More Practice
206 Allied The Leading Mathematics 1 Theme IV Our School 207 There are 41 boys, 33 girls and 12 teachers in a hall. How many total people are there in the hall? ∴ There are total 86 people in the hall. 1. Ruma has 34 pencils. Rama has 21 pencils. How many pencils do they have altogether? ∴ They have pencils altogether. + 2. John had 65 rupees. His father gave him 34 rupees. How much money does he have now? ∴ He has rupees now. + 3. Kali has 15 calculators. Hari has 21 calculators. Yukta has 33 calculators. How many calculators do they have altogether? ∴ They have calculators altogether. + 4. You have 25 marbles. Your sister gives 12 marbles and your brother gives 21 marbles. Find the total number of marbles with you. ∴ I have marbles in total. + 41 33 + 12 86 Read, Think and Tell Look, Think and Do 11.4 Word Problems on Addition up to Three Numbers
206 Allied The Leading Mathematics 1 Theme IV Our School 207 1 3 5 6 10 8 10 3 10 13 3 13 + + = 4 12 10 11 7 9 12 12 7 19 7 19 + + = Maths is Everywhere Throw a pair of dice in which one has odd numbers 1, 3, 5, 7, 9, 11 and another has even 2, 4, 6, 8, 10, 12. Add the facing numbers. + a. = + + c. = + + e. = + + b. = + + d. = + + f. = + Look, Think and Do PR OJECT WORK 11 Count the number of students in your class and other three classes and list them on an A4 paper. Find the total number of students in any two classes as different from others. Compare these sums and write in ascending and descending order. Prepare a report and present it in your classroom.
208 Allied The Leading Mathematics 1 Theme IV Our School 209 SUBTRACTION UP TO 20 Chapter 12 Lessons Pages 12.1 Subtraction up to 5 by Using Solid Objects 209 12.2 Subtracting 1, 2 and 3 211 12.3 Subtracting 4 and 5 214 12.4 Subtracting from 10 217 12.5 Subtraction Table with Sum up to 9 218 12.6 Horizontal and Vertical Subtraction 221 Math Lab Activities 225 Fun Maths on Way 226 12.7 Word Problems on Subtraction up to 10 227 12.8 Subtracting from 11 to 13 227 12.9 Subtracting from 14 to 16 230 12.10 Subtracting from 17 to 20 232 12.11 Word Problems on Subtraction from 11 to 20 234 Fun Maths with Subtraction 235 Project Work – 12 235 v How many children are looking fishes in the ponds? v How many fishes are there in the ponds (i) and (ii) ? v Which pond has more fishes and by how much ? v How many fishes are added in the fewer fishes pond so that fishes are equal in both ponds ? Warm-Up v Subtract the numbers by using solid objects whose sum is up to 20. Learning Outcomes: Instruction: Teachers are requested to discuss with students by asking more questions. Pond (i) Pond (ii)
208 Allied The Leading Mathematics 1 Theme IV Our School 209 Look, Think, Tell and Do How many apples are there in the plate? How many apples are left on it? A boy eats one apple from the plate. = 3 – 1 = 2 a. How many apples are there in the plate? How many apples are left on it? A girl eats one apple from the plate. = 2 – 1 = 1 b. How many apples are there in the plate? How many apples are left on it? Another boy eats one apple from the plate. = 1 – 1 = 0 c. How many bananas are there in the plate? How many bananas are left on it? A monkey eats one banana from the plate. = 3 – 1 = d. 12.1 Subtraction up to 5 by Using Solid Objects
210 Allied The Leading Mathematics 1 Theme IV Our School 211 How many pencils are there in the case ? A student takes one pencil from it. How many pencils remain in it ? 4 – 1 = ......... How many pencils are there in the case ? A student takes two pencils from it. How many pencils are there left in it? 4 – ........ = ........ How many pencils are there in the case ? A student takes three pencils from it. How many pencils are there left in it ? 5 – .......... = .......... How many pencils are there in the case ? A student takes four pencils from it. How many pencils are there left in it ? .......... – ........... = ............. e. f. g. h.
210 Allied The Leading Mathematics 1 Theme IV Our School 211 Look, Think, Tell and Do 9 – 1 = 8 7 – 1 = 5 – 1 = 3 – 1 = 8 – 1 = 6 – 1 = 4 – 1 = 2 – 1 = A boy comes and sits of the vacant chairs. How many chairs 1 are vacant? a. c. e. g. b. d. f. h. 12.2 Subtracting 1, 2 and 3
212 Allied The Leading Mathematics 1 Theme IV Our School 213 9 – 2 = 7 8 – 2 = 7 – 2 = 6 – 2 = 5 – 2 = 4 – 2 = 3 – 2 = 2 – 2 = Oh! I have 9 pencils. I give 2 pencils to my friends. How many pencils are left to me? Oh! I have 8 pencils. I give 2 pencils to my friends. How many pencils areleft to me? 2 a. i. ii. c. e. g. b. d. f. h.
212 Allied The Leading Mathematics 1 Theme IV Our School 213 8 – 3 = 7 – 3 = 6 – 3 = 5 – 3 = 4 – 3 = 3 – 3 = 9 – 3 = 6 9 – 3 = There are 9 apples on the tree. If 3 apples fall down, how many apples remain on the tree? There are 8 apples on the tree. If 3 apples falls down, how many apples remain on the tree? 3 a. c. e. g. b. d. f. h. i. ii.
214 Allied The Leading Mathematics 1 Theme IV Our School 215 Look, Think, Tell and Do There are 9 markers on the table. If 4 of them fall on the ground, how many markers remain on it? 9 Markers on the table 9 – 4 = 4 Markers fall 8 Markers on the table 8 – 4 = 4 Markers fall 9 Markers on the table 9 – 5 = 5 Markers fall 7 Markers on the table 7 – 5 = 5 Markers fall a. b. c. d. 12.3 Subtracting 4 and 5
214 Allied The Leading Mathematics 1 Theme IV Our School 215 1. Subtract and match with the numbers. 2 2 3 3 0 0 6 5 6 5 8 8 7 7 1 1 4 4 2 – 2 5 – 5 4 – 3 6 – 5 5 – 2 7 – 4 6 – 4 7 – 5 9 – 5 5 – 1 6 – 1 10 – 5 9 – 3 9 – 3 8 – 1 10 – 3 9 – 1 10 – 2 9 9 10 – 1 10 – 1 Look, Think and Do
216 Allied The Leading Mathematics 1 Theme IV Our School 217 = – 7 = – 4 8 – = 4 9 – = 7 – = = – 2 = – 4 = – 5 6 – = 9 – = – 1 = – 4 = = – 8 = – 5 = – 6 – 0 = 2. Make 4 by subtracting. 3. Make 5 by subtracting.
216 Allied The Leading Mathematics 1 Theme IV Our School 217 a. 10 – = 6 b. 10 – = 5 c. 10 – = 3 d. – 4 = 6 e. – 6 = 4 f. – 2 = 8 1. Subtract the following. 2. Complete the following. a. 10 – 1 = b. 10 – 3 = c. 10 – 2 = d. 10 – 4 = e. 10 – 5 = f. 10 – 8 = g. 10 – 0 h. 10 – 9 i. 10 – 7 j. 10 – 6 k. 10 – 3 l. 10 – 2 m. 10 – 5 n. 10 – 10 10 – 1 9 10 – 9 1 10 – 3 7 10 – 7 3 10 – 1 = 9 10 – 3 = 7 10 – 9 = 1 10 – 7 = 3 10 – 5 = 5 10 – 5 5 Look, Think and Tell There are 10 apples with red and green colours. Among them, 1 apple is green. How many apples are red? If 9 apples are red how many apples are green? Look, Think and Do 12.4 Subtracting from 10
218 Allied The Leading Mathematics 1 Theme IV Our School 219 Look, Think and Learn – 0 1 2 3 4 5 6 7 8 9 10 10 10 9 8 7 6 5 4 3 2 1 0 9 9 8 7 6 5 4 3 2 1 0 8 8 7 6 5 4 3 2 1 0 7 7 6 5 4 3 2 1 0 6 6 5 4 3 2 1 0 5 5 4 3 2 1 0 4 4 3 2 1 0 3 3 2 1 0 2 2 1 0 1 1 0 0 0 9 – – 1 9 1. Make 9 by subtracting. 2. Make 8 by subtracting. 3. Make 7 by subtracting. – 0 9 – 10 – 8 7 – – 1 – 2 10 – 7 Look, Think and Do Complete the Subtraction table 12.5 Subtraction Table with the Sum up to 9
218 Allied The Leading Mathematics 1 Theme IV Our School 219 5 5 – – 1 – 2 8 – – 4 – 5 4. Make 6 by subtracting. 6. Make 4 by subtracting. 5. Make 5 by subtracting. 7. Make 3 by subtracting. 4 – – 1 6 – 7 – – 4 – 5 10 – 4 3 – – 1 5 – – 3 7 – 8 – – 6 – 7 3 – 0 7 – – 2 – 3 10 – 6
220 Allied The Leading Mathematics 1 Theme IV Our School 221 8. Make 2 by subtracting. 9. Make 1 by subtracting. 10. Make 0 by subtracting. 11. Subtract 2. 12. Subtract from 5. 0 – 1 – – 2 – 3 – 4 5 – 6 – – 7 – 8 9 – 10 – 0 2 – 3 – – 2 5 – – 4 – 5 8 – 9 – – 8 2 1 – 2 – – 2 – 3 5 – 6 – 7 – – 7 – 8 – 9 1 – 2 9 6 2 5 3 4 7 8 5 – 1 2 3 4 5 0
220 Allied The Leading Mathematics 1 Theme IV Our School 221 Look, Think and Tell Horizontal Subtraction 10 – 0 = 10 10 – 1 = 9 10 – 2 = ...... 10 – 3 = ...... 10 – ....= ...... 10 – ....= ...... 10 – ....= ...... 10 – ....= ...... 10 – ....= ...... 10 – ....= ...... 10 – ....= ...... Vertical Subtraction 10 – 0 10 10 – 1 9 10 – 2 ...... 10 – 3 ...... 10 –.... ...... 10 –.... ...... 10 –.... ...... 10 –.... ...... 10 –.... ...... 10 –.... ...... 10 –.... ...... a. 4 – 2 b. 5 – 4 4 – 2 = 5 – 4 = 1. Subtract the following. Subtract the balls and apples separately. Look, Think and Do 12.6 Horizontal and Vertical Subtraction
222 Allied The Leading Mathematics 1 Theme IV Our School 223 c. 8 – 3 d. 10 – 4 8 – 3 = 10 – 4 = 1 e. 8 – 5 f. 9 – 3 8 – 5 = 9 – 3 = 1 g. 8 – 4 h. 7 – 2 8 – 4 = 1 7 – 2 = 1 i. 9 – 2 j. 7 – 5 9 – 2 = 1 7 – 5 = 1 k. 7 – 6 l. 6 – 5 7 – 6 = 1 6 – 5 = 1 m. 5 – 5 n. 8 – 7 5 – 5 = 1 8 – 7 = 1 o. 9 – 4 p. 10 – 5 9 – 4 = 1 10 – 5 = 1 q. 10 – 8 r. 6 – 4 10 – 8 = 1 6 – 4 = 1 s. 5 – 1 t. 9 – 5 5 – 1 = 1 9 – 5 = 1
222 Allied The Leading Mathematics 1 Theme IV Our School 223 2. Subtract. a. 2 – 1 = || b. 3 – 1 = ||| c. 4 – 2 = |||| d. 5 – 3 = ||||| e. 5 – 2 = ||||| f. 5 – 4 = ||||| g. 6 – 3 = |||||| h. 6 – 5 = |||||| i. 6 – 1 = |||||| j. 6 – 3 = |||||| k. 7 – 2 = ||||||| l. 7 – 5 = ||||||| m. 7 – 6 = ||||||| n. 7 – 0 = ||||||| o. 8 – 3 = |||||||| p. 8 – 8 = |||||||| q. 8 – 7 = |||||||| r. 8 – 5 = |||||||| s. 6 – 6 = || t. 9 – 3 = ||||||||| u. 9 – 4 = |||||||||| v. 9 – 7 = ||||||||| w. 10 – 3 = |||||||||| x. 10 – 7 = |||||||||| y. 10 – 9 = |||||||||| z. 10 – 10 = ||||||||||
224 Allied The Leading Mathematics 1 Theme IV Our School 225 3. Subtract and match with numbers. 9 – 1 7 – 5 4 – 1 8 – 1 9 – 4 9 – 5 9 – 0 10 – 4 7 – 6 0 – 0 10 – 0 6 3 9 8 10 2 7 1 5 0 4 5 – 1 8 – 5 6 – 6 4 – 2 9 – 3 9 – 8 9 – 2 9 – 1 10 – 1 7 – 2 10 – 0
224 Allied The Leading Mathematics 1 Theme IV Our School 225 9 8 10 2 3 1 8 8 3 5 3 5 – – = 10 10 5 5 5 5 – – = Maths Lab Activities Throw two different coloured die, one red with numbers from 1 to 6 and another green with numbers from 7 to 12. Subtract the numbers of the red dice from the green dice. – a. = – – c. = – – e. = – – g. = – – b. = – – d. = – – f. = – – h. = – 12 8 11 4 5 3 10 Look, Think and Do
226 Allied The Leading Mathematics 1 Theme IV Our School 227 Fun Maths on Way Look, Think and Reach 1. Which fruit do you get by finding the way with difference 2? 5 – 3 2 – 0 3 – 1 4 – 1 6 – 4 4 – 0 4 – 2 9 – 7 10 – 8 2 – 1 9 – 7 1 – 1 4 – 2 7 – 5 4 – 2 9 – 7 10 – 8 8 – 6 6 – 1 5 – 3 7 – 5 2 – 0 7 – 5 6 – 4 9 – 3 5 – 2 7 – 7 3 – 1 8 – 6 7 – 5 9 – 7 8 – 8 7 – 6 8 – 2 2 – 0
226 Allied The Leading Mathematics 1 Theme IV Our School 227 1. Mr. Bhusal buys 5 books. He sells 3 books. How many books are left with him? ∴ books are left with him. – 2. There are 6 birds on a branch of a tree. 3 of them fly from the branch. How many birds are left on the branch? ∴ birds are left on the branch. – 3. Kalpana has 10 rupees. She spends 7 rupees for buying a pencil. How much amount does she have now? ∴ She has rupees now. – 4. Out of 10 km, a boy walked 8 km. How many kilometers should he walk now ? ∴ He should walk km. – 5. 9 birds live in a nest. 6 of them fly away. How many birds are left in the nest? ∴ birds are left in the nest. – There were 7 birds on a tree. 3 of them flew away. How many birds are left on the tree? ∴ 4 birds are left on the tree. 7 – 3 4 = 4 Read, Think and Tell Solve. 0 1 2 3 4 5 6 7 8 9 How to slove? Look, Think and Do 7 – 3 12.7 Word Problems Subtraction up to 10
228 Allied The Leading Mathematics 1 Theme IV Our School 229 1. Subtract the following. a. 11 – 3 = b. 11 – 1 = c. 12 – 2 = d. 11 – 4 = e. 11 – 6 = f. 12 – 10 = g. 12 – 1 = h. 12 – 5 = i. 12 – 4 = j. 12 – 7 = k. 13 – 1 = l. 13 – 7 = m. 13 – 2 = n. 11 – 4 = o. 12 – 3 = p. 13 – 4 = q. 12 – 8 = r. 13 – 8 = s. 11 – 0 = t. 12 – 6 = u. 13 – 9 = v. 13 – 12 = w. 11 – 10 = x. 12 – 9 = There are 11 carrots. Harry eats 4 of them. How many carrots are left? How can we solve it? For this, we subtract 4 from 11. i.e. 11 – 4 = ? ∴ There are 7 carrots left. 11 – 4 7 11 – 4 = 7 11 0 1 2 3 4 5 6 7 8 9 10 11 – 4 Look, Think and Tell Look, Think and Do 12.8 Subtracting from 11 to 13
228 Allied The Leading Mathematics 1 Theme IV Our School 229 2. Subtract. a. 11 – 2 b. 11 – 5 c. 11 – 7 d. 11 – 9 e. 12 – 3 f. 12 – 6 g. 12 – 8 h. 12 – 10 i. 13 – 3 j. 13 – 5 k. 13 – 9 l. 13 – 11 m. 11 – 1 n. 11 – 0 o. 11 – 6 p. 11 – 10 q. 12 – 3 r. 12 – 5 s. 12 – 9 t. 12 – 11 u. 13 – 2 v. 13 – 6 w. 13 – 8 x. 13 – 10 a. 11 – 5 b. 11 – 3 c. 12 – 12 d. 12 – 9 e. 12 – 7 f. 13 – 1 g. 13 – 0 h. 13 – 8 3. Find the difference from the following subtraction.
230 Allied The Leading Mathematics 1 Theme IV Our School 231 There are 14 flowers on a rose plant. 6 of them are fallen on the ground. How many flowers are left? How can we find it? For this, we subtract 6 from 14. i.e. 14 – 6. ∴ There are 8 flowers left. Look, Think and Tell 1. Subtract the following. a. 14 – 1 = b. 14 – 5 = c. 14 – 6 = d. 14 – 9 = e. 14 – 7 = f. 14 – 12 = g. 15 – 1 = h. 15 – 6 = i. 15 – 9 = j. 15 – 9 = k. 15 – 13 = l. 15 – 2 = m. 16 – 5 = n. 16 – 6 = o. 16 – 9 = p. 16 – 10 = q. 16 – 12 = r. 16 – 11 = s. 14 – 9 = t. 15 – 8 = u. 16 – 3 = v. 16 – 1 = w. 14 – 3 = x. 15 – 5 = 14 – 6 = 8 14 – 6 8 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 14 – 6 Look, Think and Do 12.9 Subtracting from 14 to 16
230 Allied The Leading Mathematics 1 Theme IV Our School 231 2. Subtract. a. 16 – 1 b. 16 – 3 c. 16 – 7 d. 16 – 9 e. 15 – 9 f. 15 – 6 g. 15 – 7 h. 15 – 10 i. 14 – 3 j. 14 – 7 k. 14 – 9 l. 14 – 13 m. 14 – 1 n. 14 – 0 o. 14 – 6 p. 14 – 10 q. 15 – 13 r. 15 – 1 s. 15 – 9 t. 15 – 0 u. 16 – 2 v. 16 – 6 w. 16 – 8 x. 16 – 10 a. 14 – 9 b. 14 – 13 c. 15 – 12 d. 15 – 9 e. 15 – 7 f. 16 – 0 g. 16 – 2 h. 16 – 8 3. Find the difference from the following subtractions.
232 Allied The Leading Mathematics 1 Theme IV Our School 233 Look, Think and Tell 1. Subtract the following. a. 17 – 3 = b. 17 – 9 = c. 17 – 8 = d. 17 – 1 = e. 17 – 5 = f. 17 – 16 = g. 18 – 8 = h. 18 – 7 = i. 18 – 12 = j. 18 – 9 = k. 18 – 13 = l. 18 – 3 = m. 19 – 11 = n. 19 – 7 = o. 19 – 9 = p. 19 – 10 = q. 19 – 12 = r. 19 – 14 = s. 20 – 9 = t. 20 – 8 = u. 20 – 3 = v. 20 – 13 = w. 20 – 11 = x. 20 – 10 = 19 – 10 9 19 – 10 = 9 There are 19 balls with Ramita. She gives 10 balls to Sarita. How many balls are left with Ramita? How to find left balls? For this, we subtract 10 from 19. i.e. 19 – 10 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Look, Think and Do – 10 19 12.10 Subtracting from 17 to 20
232 Allied The Leading Mathematics 1 Theme IV Our School 233 2. Subtract. a. 17 – 6 b. 17 – 2 c. 17 – 9 d. 17 – 7 e. 18 – 10 f. 18 – 1 g. 18 – 3 h. 18 – 15 i. 19 – 13 j. 19 – 11 k. 19 – 9 l. 19 – 14 m. 20 – 5 n. 20 – 6 o. 20 – 8 p. 20 – 10 q. 17 – 12 r. 17 – 3 s. 17 – 11 t. 17 – 10 u. 18 – 2 v. 18 – 6 w. 18 – 8 x. 18 – 4 a. 19 – 15 b. 19 – 13 c. 19 – 12 d. 19 – 9 e. 20 – 6 f. 20 – 1 g. 20 – 2 h. 20 – 8 3. Find the difference from the following subtractions.
234 Allied The Leading Mathematics 1 Theme IV Our School 235 1. There are 19 students in class 1. 8 of them are boys. How many are girls? ∴ There are girls in the class 1. 19 – 8 11 2. There are 15 books in a rack. 5 of them are lost. How many books are left in the rack ? ∴ books are left in the rack. – 3. Salman had 14 marbles. He lost 8 of them. How many marbles are there with him? ∴ There are marbles left with him. – 4. Sita has 19 sweets. Gita has 12 sweets. How many more sweets does Sita have than that of Gita? ∴ Sita has more sweets than that of Gita. – 5. Sumana has 17 rings. Lisha has 13 rings. How many less rings are there with Lisha than that of Sumana? ∴ There are less rings with Lisha. – Look, Think and Do 12.11 Word Problems on Subtraction from 11 to 20
234 Allied The Leading Mathematics 1 Theme IV Our School 235 Fun Maths with Subtraction 1. Which number should insert in the circle to get 5? 2. Which number should insert in the blank space to get 4? 3. Which number should insert in the blank space to get 2? 4. Which number should insert in the blank space to get 1? 5 7 – 1 – 10 – 5 – 8 – 8 – 5 – 9 – 9 – ..... 4 10 – ..... 8 – ..... ..... – 0 5 – ..... 7 – ..... ..... – 3 ..... – 2 10 – ..... ..... – 5 3 – ..... ..... – 8 ..... – 6 2 – ..... ..... – 4 5 – ..... 2 1 ..... – 4 0 – 3 5 – ..... .... – 4 ..... – 5 7 – ..... 6 – ..... 8 – ..... 3 – ..... 9 – ..... Look, Think and Do PR OJECT WORK 12 Go to a fruits shop and ask the shopkeeper how many pieces of apples, oranges, mangoes, guavas, pears and kiwi are there.
236 Allied The Leading Mathematics 1 Theme IV Our School 237 SUBTRACTION OF TWO NUMBERS Chapter 13 Lessons Pages 13.1 Subtraction of 1-digit Number from 2 digit Number 237 13.2 Subtraction of 2-digit Numbers 239 13.3 Word Problems on Subtracting 2-digit Numbers 241 Maths is Everywhere 242 Project Work – 13 243 CONFIDENCE LEVEL TEST - IV 244 v How many boy-students are there in your class ? v How many girl-students are there in your class ? v Whose number is more between boy-students and girl-students ? v How many paper sheets are there in your note copy and your friend’s note copy ? v Whose note copy has more pages ? Warm-Up v Subtract two numbers without borrowing. Learning Outcomes: Instruction: Teachers are requested to discuss with students by asking more questions.
236 Allied The Leading Mathematics 1 Theme IV Our School 237 T O 2 – 7 3 2 4 1. Subtract. a. T O 2 9 – 8 b. T O 4 4 – 2 c. T O 5 4 – 3 d. T O 6 4 – 2 e. T O 8 9 – 7 f. T O 2 8 – 5 g. T O 7 5 – 4 h. T O 9 2 – 1 i. T O 8 8 – 7 j. T O 5 5 – 4 k. T O 7 8 – 3 l. T O 8 2 – 0 Look, Think and Tell ∴ 27 – 3 = 24 Samir was 27 blocks. Among them, 3 blocks were broken. How many blocks are good with him? How can we find it? For this, we subtract 3 from 27. i.e. 27 – 3. - = =24 Look, Think and Do 13.1 Subtraction of 1-digit Number from 2 digit Number
238 Allied The Leading Mathematics 1 Theme IV Our School 239 3. Find the difference from the following subtraction. a. T O 4 5 – 2 b. T O 5 5 – 4 c. T O 4 8 – 3 d. T O 6 9 – 7 e. T O 5 9 – 5 f. T O 7 8 – 3 g. T O 8 8 – 6 h. T O 9 8 – 6 i. T O 5 8 – 3 j. T O 6 5 – 1 k. T O 8 7 – 5 l. T O 5 9 – 0 m. T O 4 8 – 5 n. T O 9 5 – 3 o. T O 6 8 – 4 p. T O 9 2 – 1 2. Subtract. a. 95 – 4 = b. 85 – 2 = c. 45 – 3 = d. 55 – 4 = e. 47 – 5 = f. 39 – 6 = g. 49 – 7 = h. 79 – 4 = i. 80 – 0 = j. 88 – 8 = k. 49 – 5 = l. 55 – 1 = m. 79 – 5 = n. 47 – 5 = o. 98 – 4 = p. 84 – 2 = q. 54 – 1 = r. 99 – 6 =
238 Allied The Leading Mathematics 1 Theme IV Our School 239 1. Subtract. a. T O 9 9 – 6 4 b. T O 4 6 – 2 3 c. T O 5 8 – 3 5 d. T O 7 9 – 2 5 e. T O 8 6 – 5 5 f. T O 7 8 – 4 8 g. T O 9 9 – 6 1 h. T O 4 9 – 3 7 i. T O 7 7 – 6 3 j. T O 7 9 – 5 5 k. T O 8 2 – 5 1 l. T O 9 5 – 7 5 m. T O 7 1 – 6 1 n. T O 9 5 – 7 5 o. T O 6 3 – 4 3 Look, Think and Tell ∴ 48 – 36 = 12 T O 4 – 3 8 6 1 2 There are 48 markers in a box. If 36 of thm is distributed to the teachers. How many markers are left in the box? Look, Think and Do 13.2 Subtraction of 2-digit Numbers
240 Allied The Leading Mathematics 1 Theme IV Our School 241 3. Find the difference from the following subtraction. a. T O 8 9 – 6 3 b. T O 9 6 – 3 3 c. T O 7 8 – 6 6 d. T O 6 9 – 5 4 e. T O 5 6 – 4 4 f. T O 4 8 – 3 7 g. T O 5 9 – 2 8 h. T O 7 9 – 3 5 i. T O 4 7 – 2 5 j. T O 6 9 – 3 5 k. T O 6 2 – 4 1 l. T O 4 5 – 2 5 m. T O 6 1 – 3 1 n. T O 3 5 – 1 4 o. T O 9 3 – 3 3 p. T O 9 2 – 6 1 q. T O 9 5 – 7 4 r. T O 8 1 – 4 0 s. T O 9 5 – 4 2 t. T O 9 9 – 8 3 2. Subtract. a. 28 – 15 = b. 39 – 16 = c. 48 – 26 = d. 75 – 52 = e. 35 – 13 = f. 95 – 74 = g. 88 – 56 = h. 45 – 24 = i. 98 – 22 = j. 75 – 54 = k. 78 – 77 = l. 92 – 41 = m. 99 – 46 = n. 68 – 57 = o. 93 – 62 = p. 65 – 53 = q. 89 – 59 = r. 94 – 42 =
240 Allied The Leading Mathematics 1 Theme IV Our School 241 In the store of a shop there were 56 boxes. 24 boxes were sold. How many boxes are left now? ∴ 32 boxes are left now. 1. Suresh's father is 58 years old while Suresh is 21. How many years older is his father than him? ∴ His father is years older than him. – 2. There were 48 apples in a container. A group of boys ate 32 of them. How many apples are left? ∴ apples are left. – 3. A book costs Rs. 75, while a note copy costs Rs. 48 only. By how much is the book expensive? ∴ The book is expensive by Rs. than the note copy. – 4. In a class of 38 students, 16 are boys. How many are girls. ∴ There are girls in the class. – 5. Shyam had 96 rupees. He spent 52 rupees for buying a book. How much has left with Shyam? ∴ rupees has left with Shyam. – Look, Think and Tell T O 5 – 2 6 – 4 2 3 Look, Think and Do 13.3 Word Problems on Subtracting 2-digit Numbers
242 Allied The Leading Mathematics 1 Theme IV Our School 243 Group 'A' Group 'B' Each student draws two plying cards and adds the points of the cards to him/her. The student who has more sum is the winner. Each student draws two playing cards and subtracts the points of the cards to him/her. The student who has less difference is the winner. 10 10 2 2 4 4 10 10 9 9 4 4 3 3 3 3 8 8 A A 10 10 5 5 10 10 4 4 10 10 Math is Everywhere Playing cards with Ace to King A A 2 2 3 3 4 4 5 5 6 6 7 7 1 2 3 4 5 6 7 8 8 9 9 10 10 10 10 10 10 8 9 10 11 12 13 Playing Rules
242 Allied The Leading Mathematics 1 Theme IV Our School 243 Count the number of grapes in 1 kg, now suppose given below: Suppose you ate 10 of them, how many grapes are left? Similarly, if your daddy ate 15 grapes from the left, how many grapes are remaining? If your mummy ate 12 grapes, how many are left? If your brother ate 11 grapes, how many are left? If your sister ate 21 grapes, how many grapes are left ? And then your aunt ate 5 grapes, how many are left at last? Remaining grapes after eating by you, – Remaining grapes after eating by your daddy, – Remaining grapes after eating by your mummy, – Remaining grapes after eating by your brother, – Remaining grapes after eating by your sister, – Remaining grapes after eating by your aunt, – Total Number of Grapes = PR OJECT WORK 13
244 Allied The Leading Mathematics 1 Theme IV Our School 245 CONFIDENCE LEVEL TEST - IV Name :………………………….. Class : 1 Roll No.: ……. Subject: Mathematics Time : 40 minutes FM: 20 Attempt all the questions. 1. Observe the order of the following animals and answer the following questions. [3] 2. Count and add. [4] (a) Which animal is in the first ? (b) Which animal is in the last ? (c) Write the order of Zebra? (a) + + (a) + = + = 3. Add the following. [4] (a) 2 2 (b) (c) (d) + 1 6 5 2 + 2 4 3 4 + 6 5 4 6 2 2 + 3 1
244 Allied The Leading Mathematics 1 Theme IV Our School 245 4. Subtract the following. [4] 5. Solve the following the following. [5] 28 – 15 = (a) (b) (c) (d) 4 9 – 1 3 6 8 – 4 1 5 4 – 3 2 a. Newton is 35 years and and his father is 24 years older. How old is his father? ∴ His father is …….. years old. – b. There are 45 students in a class. If there are only 13 boy-students, how many girl-students are there in the class? ∴ There are …... girl-students in the class. – Best of Luck
246 Allied The Leading Mathematics 1 Theme V Our Creation 247 Competency: Identify and draw two dimensional geometric shapes. Lines and Shapes OUR CREATION Theme V 14. Drawing Lines 15. Geometric Shapes Chapters Estimated Teaching Hours: 8 [Theory + Practical ]
246 Allied The Leading Mathematics 1 Theme V Our Creation 247 DRAWING LINES Chapter 14 Lessons Pages 14.1 Identifying Outer Line of Solid 248 14.2 Drawing Outer Lines of Solid 251 14.3 Tracing Lines 252 Project Work – 14 254 v Separate in-out, front-back, above-below, left-right, between and near-far on the basis of position of the objects. Learning Outcomes: v Which are the edges of door and window of house ? v Which are the edges of your book, ruler and bottle ? v What type of line can we draw from the edge of the ruler ? v What type of line can we draw from the edge of the lid of bottle ? v Similarly, what type of line is drawn from the rectangular objects ? v What type of line is drawn from the cubical objects ? v Similarly, what type of line is drawn from the circular objects ? Warm-Up Instruction: Teachers are requested to discuss with students by asking more questions.
248 Allied The Leading Mathematics 1 Theme V Our Creation 249 In our house, What type of line have/has/edge of walls? What types line of edges of window and door? What are the corners of the room like ? What is the edge of the ladder like ? What is the shape of plate like ? What is the shape of the base of a cup ? What is the shape of spoon? What is the shape of scoop? What is the shape of the handle of cup ? What is the shape of the sole of shoe? Look, Think and Tell Discuss the different types of lines like: straight line, curved line, horizontal line, vertical line, slanting line, etc. by observing the solids found in our house, surroundings and school. 14.1 Identifying Outer Line of Solid
248 Allied The Leading Mathematics 1 Theme V Our Creation 249 In our school What is the shape of the gate of school? What is the shape of the swing? What is the shape of the board? What is the shape of the bench? What is the shape of the chalk or marker? What is the shape of the water bottle? What is the shape of the base of the marker? Write the answers of the above questions in your copy. In our surroundings What is the shape of the road? What is the shape of the pole? What is the shape of the tree? What is the shape of the river? What is the shape of cucumber? What is the shape of the wire?
250 Allied The Leading Mathematics 1 Theme V Our Creation 251 1. Tick () the straight objects that is and cross (×) the curved one. 2. Write 'C' for curve, 'H' for horizontal, 'V' for vertical and 'S' for slanting objects. Pillar Road Edge Wire Look, Think and Do