Math 1

Numbers from 50 to 100

Look and learn.

5 Tens and 6 Ones = 56 6 Tens and 3 Ones = 63
Fifty-six Sixty-three

Complete as above:

Tens and Ones = Tens and Ones =

Tens and Ones = Tens and Ones =

Tens and Ones = Tens and Ones =

Oasis School Mathematics Book-1 101

Write the number and number name as shown:

5 Tens + 6 Ones = 56 Fifty-six
6 Tens + 1 Ones =
7 Tens + 2 Ones =
8 Tens + 7 Ones =
5 Tens + 9 Ones =
9 Tens + 3 Ones =
6 Tens + 8 Ones =
9 Tens + 3 Ones =

Write the numbers from 51 to 100
51 56

75 70
84
93 100
Write the number name of:
76
82 64
89
93 57
59
91

102 Oasis School Mathematics Book-1

Write the numerals: Sixty-eight
Fifty-six

Eighty-eight Ninety-seven

Seventy Seventy-three

Fifty-one Sixty-six

Write the number which comes just before: 79
52 60 90

88 83

97 70 72

74 67 93

88 77 66
Write the number which comes just after:
87
53 96 74
59 63 88
86 93 89
61 76 99
66 88

Oasis School Mathematics Book-1 103

Write the number which comes in between: 44 46
55 57 84 86 55 57
79 81 56 58 33 35
97 99 58 60 78 80
84 86 62 64

Add: 60 + 4 = 55 + 1 =
50 + 3 = 40 + 3 =
60 + 4 =
70 + 6 = 80 + 2 = 50 + 5 =
33 + 3 =
90 + 5 = 50 + 9 =
55 = 50 + 5
80 + 7 = 90 + 1 =

50 + 4 = 60 + 3 =

Break the number as shown:

24 = 20 + 4 37 = 30 + 7

43 = 40 + 3 62 = + 44 = +

87 = + 92 = + 33 = +
73 = + 69 = + 65 = +
84 = + 39 = + 95 = +
27 = + 86 = + 85 = +

104 Oasis School Mathematics Book-1

Numbers in Abacus

Look and learn.

43 = 4 Tens and 3 Ones 46 =4 Tens and 6 Ones 32= 3 Tens and 2 Ones

Tens Ones Tens Ones Tens Ones

Complete as above:

45 = Tens and Ones 38 = Tens and Ones

Tens Ones Tens Ones

25 = Tens and Ones 38 = Tens and Ones

Tens Ones Tens Ones

40 = Tens and Ones 31 = Tens and Ones

Tens Ones Tens Ones

Oasis School Mathematics Book-1 105

23 = Tens and Ones 44 = Tens and Ones

Tens Ones Tens Ones

Write the number and the number name as shown:

Tens Ones Tens Ones

Tens Ones Tens Ones
3 2 Thirty two

Tens Ones Tens Ones

Tens Ones Tens Ones

Tens Ones Tens Ones

Tens Ones Tens Ones

106 Oasis School Mathematics Book-1

Worksheet Identify the Jersey number of the following

players.

My number has 3 My number is 1
Tens and 4 Ones. more than 9.

My number is 10 My number is
more than 24. 2 less than 52.
My number comes
My number comes just after 62.
just before 23.

Oasis School Mathematics Book-1 107

Devnagari Numbers

Devnagari numbers from 21 to 100

Hindu Arabic 21 22 23 24 25 26 27 28 29 30
Number

bj] gfu/L ;+Vof @! @@ @# @$ @% @^ @& @* @( #)

Hindu Arabic 31 32 33 34 35 36 37 38 39 40
Number

b]jgfu/L ;+Vof #! #@ ## #$ #% #^ #& #* #( $)

Hindu Arabic 41 42 43 44 45 46 47 48 49 50
Number

bj] gfu/L ;V+ of $! $@ $# $$ $% $^ $& $* $( %)

Hindu Arabic 51 52 53 54 55 56 57 58 59 60
Number

b]jgfu/L ;+Vof %! %@ %# %$ %% %^ %& %* %( ^)

Hindu Arabic 61 62 63 64 65 66 67 68 69 70
Number

b]jgfu/L ;V+ of ^! ^@ ^# ^$ ^% ^^ ^& ^* ^( &)

Hindu Arabic 71 72 73 74 75 76 77 78 79 80
Number

b]jgfu/L ;V+ of &! &@ &# &$ &% &^ && &* &( *)

Hindu Arabic 81 82 83 84 85 86 87 88 89 90
Number

b]jgfu/L ;V+ of *! *@ *# *$ *% *^ *& ** *( ()

Hindu Arabic 91 92 93 94 95 96 97 98 99 100
Number

bj] gfu/L ;V+ of (! (@ (# ($ (% (^ (& (* (( !))

108 Oasis School Mathematics Book-1

Write the following numbers in Devanagari. 17
10 12 15 29
39
21 23 24 50
30 34 37 59
45 46 49 91
99
51 40 58 67

63 78 84 @*
#(
94 79 57 $&
^#
86 20 81 **
((
Write the following numbers in Hindu-Arabic. !)

!^ @# @&

#! #$ #*

$) $! $#
%! %$ %%
&! &* *@

(! ($ (%

&@ ** %)

Oasis School Mathematics Book-1 109

b]jgfu/Ldf ! bl] v !)) ;Ddsf ;V+ ofx? n]Vgx' f;] \ M ( !)

! @ # $ %^& *

!))

110 Oasis School Mathematics Book-1

Comparison of two digit Numbers

Look and learn. > is greater than
My marks is 26. My marks is 37. < is less than
= is equal to

Tens Ones Tens Ones Who got more marks?
26 37
Let’s compare the digit in the
tens place.

3 is greater than 2

Hence, 37 is greater than 26.

The number which has greater digit in the Tens place is
greater than the other.

I have 47 rupees. I have 42 rupees.
Who has more money?

Tens Ones Tens Ones Digits in the place of Tens are same.
47 42 Lets compare the digit in Ones
place.

7 is greater than 2

If the digit in the tens place are the same, the number which has
greater digit in the ones place is greater than the other.

Oasis School Mathematics Book-1 111

Circle the bigger number: 93 62
45 86

37 48 31 58
82 49 63 50
28 92 46 53

Circle the smaller number: 25 22
17 19

38 33 27 26

49 47 51 53
68 69 77 72

Colour the box having smaller number in each pair.

27 92 92 82 26 23 67 52

58 63 73 76 82 84 80 86

97 54 52 96 55 41 62 65
18
Colour the box having greater number in each pair.

16 13 29 27 46 21 15

33 31 58 63 26 26 37 39

68 73 77 73 55 41 62 65

112 Oasis School Mathematics Book-1

Ordering of Numbers

Look and learn.

Ordering of two-digit numbers

10 11 12 13 14 15 16 17 18 19
Ascending order

19 18 17 16 15 14 13 12 11 10

Descending order

Write all the numbers from 20 to 29.

20 29
Ascending order

29 20
Write all the numbers from 30 to 39. Descending order

30 36
Ascending order
39 30
Write all the numbers from 40 to 49.
Descending order
40
49
49 Ascending order

40
Descending order

Oasis School Mathematics Book-1 113

Arrange the following numbers in ascending order:

25 28 37 15 47 84 87 23 36 49

15 25 28 37 47

67 38 25 18 76 49 54 68 34 23

Arrange the following numbers in descending order:

11 13 18 14 10 48 49 58 69 32

18 14 13 11 10

27 32 35 46 58 92 93 76 67 83

Write the numbers forward starting from the given number.
27 28 29 30 31 32
35
82
76
58

Write the numbers backward starting from the given number.
46 45 44 43 42 41
9
23
34
57

114 Oasis School Mathematics Book-1

Visit 10 people of your community. Ask their name
and age. Write their name and age in both Hindu

Project Work Arabic and Devanagari numbers and arrange their

ages in ascending and descending order.

S.N. Name Age in Age in
Hindu Devanagari
1. Arabic
2.
3.
4.
5.
6.
7.
8.
9.
10.

Ages in ascending order.

Ages in descending order.

Oasis School Mathematics Book-1 115

Unit Evaluation Full Marks : 30

1. Write the numeral in the box. 2

1 more than 30 1 more than 68

1 less than 57 1 less than 90

2. Write the numbers of the following number names. 2

Forty-three Sixty-nine

Seventy-eight Ninety-two

3. Write the number names of the following numbers. 2

87 76

43 39

4. Write the number which comes just before or after. 4

82 80 53 27

37 62 69 57

5. Write the number which comes in between: 2

23 25 56 58

69 71 92 94

6. Write the missing numbers. 2

51 53 54 56 59 60

116 Oasis School Mathematics Book-1

7. Write the missing numbers. 2

72 70 67 65

8. Write the correct number in the box. 2

4 Tens + 3 Ones = 8 Tens + 2 Ones =

3 Tens + 7 Ones = 7 Tens + 5 Ones =

9. Fill in the blanks with correct numbers. 2

26 = Tens + Ones 57 = Tens + Ones

83 = Tens + Ones 67 = Tens + Ones

10. Write the numbers skipping 10’s. 2

10 40 60 80

11. Add: 2
2
40 + 30 = 50 + 20 =

40 + 6 = 30 + 7 =

12. Write all the even numbers from 11 to 19.
11 19

13. Add: 4

13 15 12 9

+6 +4 +5 +8

Oasis School Mathematics Book-1 117

Our School

Contents
• Subtraction of Numbers upto 20
• Ordinal Numbers
• Addition of two-digit numbers without carry over
• Subtraction of two digit numbers without

borrowing

118 Oasis School Mathematics Book-1

Subtraction of Numbers upto 20

Look and the following example and get the idea of subtraction.

8 8 balls are there. Cancel 3
–3 balls among them. Count
how many left.
5

Subtract as above:

9
–4

12
–5

11
–6

14
–6

10
–7

13
–6

Oasis School Mathematics Book-1 119

Subtraction by counting backward

Look at the given example and get the idea of subtraction by counting

backward.

13 Keep 13 in your mind, 7 hand,
–7 count 7 steps backward 12, 11,

6 10, 9, 8, 7, 6.

Subtract:

15 13 18 15 8

–4 –3 –8 –4 –6

17 16 13 11 10

–4 –7 –5 –6 – 2

19 13 17 15 12

–7 –6 –8 –7 – 9

11 18 11 93

–4 –3 –2 – 5 –1

12 17 11 4 8

–2 –4 –8 –4 –2

120 Oasis School Mathematics Book-1

Verbal problems on Subtraction

Take out 8 balls from the basket of 13 balls.
How many balls are left in the basket?

13 To get its answer
–8 I have to subtract

5 8 from 13.

Take out 7 pencils from the pack of 12 pencils.
How many pencils are left?

There were 12 students in a class. 5 students
got out from the class.
How many students are left in the class?

There were 15 chocolates in a tray to celebrate the
birthday of Aryan in his classroom. He distributed
9 of them to his friends.
How many chocolates are remained on the tray?

In a classroom, there were 18 students.
5 students went out.
How many students are left in the class?

Take out 5 balloons from 13 balloons.
How many balloons are left there?

Oasis School Mathematics Book-1 121

Addition and Subtraction together

There were 5 birds in a tree.
Again, 4 birds came here.
Now, how many birds are there on the tree?

5+4 = 9

Again, 3 birds flew away.
How many birds left?

9–3 = 6

Solve the following problems.

1. There were 6 apples in a tray. My mother kept 2 more apples and father
took 4 apples from the tray how many apples are left on the tray?

+= –=

2. There are 8 copies in bag. Put 5 more copies there and take out 4
copies from there, how many copies are there?

+= –=

3. There were 7 pencils in a box. A boy took 5 of them and teacher again
kept 6 more pencils there how many pencils were there?

+= –=

4. There were 17 people in a meeting. 5 people left the meeting and
7 people joined the meeting. How many peoples were there in the
meeting.

+= –=

122 Oasis School Mathematics Book-1

Number Combination

Lets make the number combination of 11.

9 + 2 = 11 8+ = 11

7+ = 11 + 5 = 11

+ 4 = 11 3+ = 11

10 + = 11 2+ = 11

Number combination of 12.

10 + = 12 9+ = 12

7+ = 12 8+ = 12

+ 5 = 12 + 1 = 12

+ 3 = 12 4+ = 12

+ 8 = 12 2+ = 12

+ 6 = 12 12 + = 12

Oasis School Mathematics Book-1 123

Write the correct number on the box.

3+ = 11 4 + = 12 + 7 = 13

6+ = 11 6+ = 12 + 8 = 13

+ 3 = 11 5 + = 12 6+ = 13

Complete the table given below:

5 + ...... 6 + ........ 2 + ....... ....... + 3 ...... + 6
7 + .......
...... + 10 12
107 + ....... 3 + ...... 2 + .......
4 + ...... ...... + 58 + ....... 11+.......

7 + ....... 8 + .......9 + ....... 9 + ....... 10 + ......
6 + ....... 11 + ......
11 10+....... 12 + ......
6 + ....... 4 + ....... 4 + ...... 3 + ......
5 + ....... 3 + ....... 15 8 + ......

7 + ......

124 Oasis School Mathematics Book-1

Ordinal Number

Look and learn.

Nima Hasan Eliza Sweta Pasang Aayuna
First (1st) Second (2nd) Third (3rd) Fourth (4th) Fifth (5th) Sixth (6th)

I am the first. I am the
third.

Let’s see the position of these kids.

Position of Nima is First. Write the ordinal Write the
Position of Hasan is Second. numbers for the number for the
given ordinal
following:
numbers:
2 ...................
First ................

Position of Eliza is Third. 3 ................... Third ..............
Position of Sweta is Fourth. 4 ................... Fifth ..............
Position of Pasang is Fifth. 1 ................... Sixth ..............
5 ................... Fourth.............
6 ................... Second............

First (1st), Second (2nd), Third (3rd), Fourth (4th), Fifth (5th), etc. are ordinal
numbers.

Oasis School Mathematics Book-1 125

Colour the circle of the given position as shown.

Third :
Fifth:
Tenth :
Ninth:
Fourth :

Write the position of your friends.

Himanka Zenith Anasuya Sohaib Mumtaj Mary John Pemba Anish Krisha

Position of Zenith

Position of Sohaib My position is
Position of Mary the first.
Position of Anasuya
Position of Himanka
Position of Pemba

Position of Krisha

Position of John

126 Oasis School Mathematics Book-1

Write the Ordinal number of the following daily activities.

Write the Ordinal number of your daily activities.

Wake up Go to school Brush the teeth

Have the breakfast Have the lunch Have the dinner

Go back home from Do homework Go to bed
school

Oasis School Mathematics Book-1 127

Activity Observe your morning assembly and
write the names of your friends according
to their order.

S.No. Boys S.No. Girls
1. 1.
2. 2.
3. 3.
4. 4.
5. 5.
6. 6.
7. 7.
8. 8.
9. 9.
10. 10.
11. 11.
12. 12.
13. 13.
14. 14.
15. 15.

128 Oasis School Mathematics Book-1

Worksheet Help Motu to reach Patlu's home.

Hint: Always move to the even numbered station.

Colour the path.

Patlu's home

16 17 20

12 18 13

11 14 8

10 76

First station : 6 Motu's home
Third station : Second station :
Fifth station : Fourth station :
Sixth station :

Oasis School Mathematics Book-1 129

Unit Evaluation Full Marks : 22

1. Subtract: 5

17 18 15 16 18
–5 –3 –5 –7 –4

2. Write the ordinal number of : 4
25

31

3. Write the number for given ordinal number. 4

Sixth Seventh Third Eighth

4. Write the correct number on the box. 4

+ 7 = 12 + 4 = 11

7 + = 13 9 + = 13

5. There were 8 people in the meeting. 6 people joined the
meeting and 4 people left the meeting. Find how many people
are there in the meeting. 3

6. There are 19 students in a class, 9 of them are girls. Find the
number of boys. 2

130 Oasis School Mathematics Book-1

Addition of Two-digits Numbers

Addition of three numbers.

4+5+2

Add:

9 +2 Add first two

11 Add the sum with the last number.

7+3+2

10 + 2 Add first two

12 Add the sum with the last number.

Add as above. 4+3+2 2+5+3
5+2+3

+3 +2 +3

3+4+6 6+2+1 5+6+3

+6 +1 +3

Oasis School Mathematics Book-1 131

Look and learn.

Add:

3 8 57 5+2=7
+5 +2
Add 3 + 5 = 8 7 + 4 = 11
Add 8 + 4 = 12 +4
+4
11
12

Add as above: 9 6
4 +2 +4
+4 +3
+2
+4 6 5
+3 +2
4 +5 +4
+3
+2 4 5
+4 +3
8 +3 +2
+3
+4 3 5
+8 +7
2 +4 +6
+7
+9

132 Oasis School Mathematics Book-1

Addition of a one-digit number with two-digit number using
number lines

20 21 22 23 24 25 26 27 28 29 30 31 32 33 34

24
Point your pencil at 24 and go 5 steps

+ 5 forward.
29

Add the following using number line.

33 34 35 36 37 38 39 40 41
36 38 34 33
+3 +3 +5 +6

40 41 42 43 44 45 46 47 48 49
42 40 41 46
+3 +8 +6 +3

50 51 52 53 54 55 56 57 58 59 60

51 52 54 50
+6 +6 +5 +7

Oasis School Mathematics Book-1 133

Addition of one-digit Number with a 2-digit Number

Look and learn.

Tens Ones Add ones:
4 5 5 + 4 = 9, write the total in
+ 4 Ones place.
4 9 Add Tens: 4 +0 = 4

Add: Ones Tens Ones Tens Ones
Tens
4 4 2 4 5
3 4 + 6 + 2
+

Tens Ones Tens Ones Tens Ones

24 1 2 52
+5 + 6 +5

Tens Ones Tens Ones Tens Ones

24 3 6 56
+4 + 3 +2

Tens Ones Tens Ones Tens Ones

31 8 2 74
+8 + 6 +5

134 Oasis School Mathematics Book-1

Addition of two-digit Numbers using tens and ones

Look and learn.

Tens Ones Add Ones : 3 + 1 = 4
5 3 Add Tens : 5 + 2 = 7
1
+2
4
7

Add: Ones Tens Ones Tens Ones
Tens
2 3 1 2 35
+6 2 +5 4 +2 1

Add: Ones Tens Ones Tens Ones
Tens
8 5 4 1 4
1 1 +4 5 +3 2
+3

Tens Ones Tens Ones Tens Ones

2 8 6 2 8 1
+4 1 +3 5 +1 8

Oasis School Mathematics Book-1 135

Addition without using Tens and Ones

43 I know! I have
to add Tens
+25
68 Add Tens : 4 + 2 = 6 and Ones

Add Ones : 3 + 5 = 8

Add: 42 45 12
63 +2 3 +2 3 +6 3

+3 1

54 63 65 58
+3 2 +1 2 +1 3 +3 1

26 16 52 57
+3 2 +1 2 +1 3 +2 1

62 42 32 44
+2 3 +2 4 +1 4 +1 3

32 65 12 23
+3 3 +2 0 +7 4 +6 1

22 45 42 13
+3 3 +1 0 +4 5 +5 6

136 Oasis School Mathematics Book-1

Simple verbal problems on Addition

Look and learn.

Read the problem carefully and understand what it says. The words
you will see in addition word problem are:

Total Altogether Sum

In class I, 20
+1 5
There are 20 boys and 15 girls.
35
How many students are there
altogether?

There are 35 students altogether.

Anasuya had 25 pencils.

Her mother gave her 12 more pencils. 25
+1 2
How many pencils does she have now?
45
∴ She has pencils. +23

Himanka had Rs 45.

His father gave him Rs. 23.

How much money does he have now?

∴ He has Rs. now.

Oasis School Mathematics Book-1 137

Zenith had 20 apples. He bought 20
28 more apples. How many apples +2 8
does he have?

∴ He has apples.

Dhaniya has 35 red marbles and 43
blue marbles. How many marbles
does she have altogether?

∴ She has marbles.

Aadhya has 46 red balloons and 32
blue balloons. How many balloons
does she have altogether?

∴ She has balloons.

There are 25 pages in a book and 62
pages in another book. How many
pages are there altogether?

∴Altogether there are pages.

My father gave me Rs. 35. My
mother gave me Rs. 43. How much
money do I have in total?

∴ I have Rs. in total.

138 Oasis School Mathematics Book-1

Solve as above:

There are 25 students in section A and 32
students in section B of class I, what is the
total number of students in both sections.

There are 13 benches in a class and 12
chairs in a school. What is the total number
of furniture in the school?

In my school there are 27 male teachers
and 32 female teachers. Find the total
number of teachers in my school.

Aadhya borrowed a book from the library.
She read 34 pages on first day and 23
pages on second day. How many pages
did she read in two days?

A boy did his Maths homework in 25
minutes and Science homework in 34
minutes. How many minutes did she take
to do all her homework?

Oasis School Mathematics Book-1 139

Addition in Expanded form:

Look and learn.

3 Tens and 5 Ones = 35
+ 2 Tens and 3 Ones = +2 3

5 Tens and 8 Ones = 58

4 Tens and 5 Ones = 4 5 3 Tens and 6 Ones =

+ 3 Tens and 2 Ones = + 3 2 + 2 Tens and 1 Ones = +

140 Oasis School Mathematics Book-1

Worksheet

Mo Mo : Per plate Rs 54

Swing : Rs 42 per hour

Ice cream : Rs 53

Horse riding : Rs 25 per hour

Sliding : Rs 30 per hour

How much money did these students spend at the fete?
ate 1 plate MoMo
and played
sliding.

ate 1 ice cream
and played sliding.

played sliding and rode horse
for 1 hour.

played swing and sliding.

Oasis School Mathematics Book-1 141

Subtraction of Two-digits Numbers

Subtraction facts:

Subtraction from 1

1–0= 1–1=

Subtraction from 2

2–0= 2–1= 2–2=

Subtraction from 3 Subtraction from 4

3–0= 3–2= 4–0= 4–3=
3–1= 3–3= 4–1= 4–4=
4–2=

Subtraction from 5 Subtraction from 6

5–0= 5–3= 6–0= 6–4=

5–1= 5–4= 6–1= 6–5=

5–2= 5–5= 6–2= 6–6=

6–3=

Subtraction from 7 Subtraction from 8

7–0= 7–4= 8–0= 8–5=

7–1= 7–5= 8–1= 8–6=

7–2= 7–6= 8–2= 8–7=

8–3= 8–8=

7–3= 7–7= 8–4=

Subtraction from 9 Subtraction from 10

9–0= 9–5= 10 – 0 = 10 – 5 =

9–1= 9–6= 10 – 1 = 10 – 6 =

9–2= 9–7= 10 – 2 = 10 – 7 =

9–3= 9–8= 10 – 3 = 10 – 8 =

9–4= 9–9= 10 – 4 = 10 – 9 =

10 – 10 =

142 Oasis School Mathematics Book-1

Subtraction using Number Line

20 21 22 23 24 25 26 27 28 29 30

28 Point your finger
– 5 at 28. Go 5 steps
23 backward.

Using the given number line, subtract the following:

10 11 12 13 14 15 16 17 18 19 20

19 18 15 16 14
–6 –6 –3 –5 –2

20 21 22 23 24 25 26 27 28 29 30

29 28 30 27 25
–5 –3 –3 –4 –5

30 31 32 33 34 35 36 37 38 39 40
39 35 38 37 36
–5 –2 –7 –5 –2

40 41 42 43 44 45 46 47 48 49 50
49 45 48 47 46
–5 –2 –7 –5 –2

Oasis School Mathematics Book-1 143

Subtraction using Tens and Ones:

Look and learn.

Tens Ones Subtract ones: 5 – 1 = 4
3 5 Then, subtract tens: 3 – 2 = 1
1
–2 4
1

Subtract:

Tens Ones Tens Ones Tens Ones
8 4 9 6
64 2 –3 6
–5
–2 1

Tens Ones Tens Ones Tens Ones
6 7 8 5 6 8
0 2 –4 0
–5 –3

Tens Ones Tens Ones Tens Ones
5 0 3 8 2 9
0 6 8
–2 – –

Tens Ones Tens Ones Tens Ones
4 3 4 8 3 7
2 6 0
–2 –2 –2

144 Oasis School Mathematics Book-1

Subtraction without using Tens and Ones

Look and learn.

68 Subtract Ones: 8 – 4 = 4
–34 Subtract Tens: 6 – 3 = 3

I know! I have to sub-
tract Tens and Ones

separately.

Subtract: 48 43 64 74
37 – 34 – 21 – 44 – 32

– 14 84
– 33
28 45 87 93
– 16 – 21 – 63 – 82

96 82 76 67 98
– 83 – 71 – 15 – 47 – 36

45 56 45 36 86
– 41 – 45 – 13 – 12 – 56

Oasis School Mathematics Book-1 145

Subtraction in Expanded form

Look and learn.

5 Tens and 3 Ones = 53
– 2 Tens and 2 Ones = –2 2

3 Tens and 1 Ones = 31

Subtract as above: 6 7 7 Tens and 8 Ones = 78
– 4 3 – 6 Tens and 3 Ones = –6 3
6 Tens and 7 Ones =
– 4 Tens and 3 Ones =

8 Tens and 6 Ones = 8 6 9 Tens and 3 Ones = 93
– 6 Tens and 2 Ones = – 6 2 – 5 Tens and 3 Ones = –5 3

Subtract as above: 4 3 7 Tens and 2 Ones = 7 2
4 Tens and 3 Ones = – 2 0 – 6 Tens and 1 Ones = – 6 1

– 2 Tens and 0 Ones =

8 Tens and 0 Ones = 8 0 3 Tens and 8 Ones = 38
– 4 Tens and 0 Ones = – 4 0 – 2 Tens and 1 Ones = –21

146 Oasis School Mathematics Book-1

Simple verbal problems on Subtraction

Look and learn.

Read the problem carefully and understand what it says. The word you
will see in word problems of subtraction are:

different less take away
left

remainder

I know! When I have
to subtract.

Rewa had 9 toffees. She gave 5 9
toffees to her friends. How many –5
toffees does she have now?
She has 4 toffees. 4

Santosh had 28 pencils. 28
He lost 16 pencils. –16
How many pencils are left with
him? 12

pencils are left. Oasis School Mathematics Book-1 147

Solve as above:

There were 48 mangoes on a tree. 26
mangoes fell down. How many mangoes
are left on the tree?

mangoes are left on the tree.

There are 56 students in class I. 32

of them are boys. How many are
girls?

are girls.

Prapti had Rs. 75. She spent Rs 54.
How much money does she have
now?

She has Rs

Anasuya bought 58 mangoes. She
gave 32 mangoes to her friends. How
many mangoes does she have now?

She has mangoes now.

There were 46 sweets on a tray.
24 sweets are picked.

How many sweets are left on the
tray?

There are sweets on the tray.

148 Oasis School Mathematics Book-1

Out of 48 students in class I, 27
are boys how many of them are
girls?

Out of 85 books in library, 53 books
were taken by students. How many
books are left in the library?

Out of 78 pages in a books a girl
studied 42 pages, how many
pages are left to study?

Out of 98 teachers, 46 are male
teachers, how many teachers are
female?

Sanju has 68 dolls, she gave 12
dolls to her best friend. How
many dolls does she have now?

Oasis School Mathematics Book-1 149

Addition of two digit Numbers with carry over

Look and learn.

carry over Tens Ones 2 Tens + 5 Ones
1 + 3 Tens + 6 Ones
5 + 11 Ones
2 6 5 Tens
+3
1 = 5 Tens + 1 Ten + 1 One
6
= 6 Tens + 1 One

= 61

Add as above. + Tens + Ones
carry Tens + Ones
over = Tens + Ones
Tens Ones =
= Tens + Tens + Ones
57 Tens + One

+3 6

carry Ones + Tens + Ones
over Tens + Ones
= Tens + Ones
Tens =
=
48 Tens + Tens + Ones
Tens + One
+3 6

150 Oasis School Mathematics Book-1