Math 1

Numbers from 81 to 90.

See, Learn and Understand. Eighty-six

Eighty-one

81 86

Eighty-two Eighty-seven

82 87

Eighty-three Eighty-eight

83 88

Eighty-four Eighty-nine

84 89

Eighty-five Ninety

85 90

Mathematics 1 97

Write the name of numbers. Write the
missing
83 89 numbers.
81 82
85 84 81
87 88
86 90 84

Write the numbers. 86

Eighty-one Eighty-nine 88

Eighty-five Eighty-two 90

Eighty-seven Eighty-three Mathematics 1

Eighty-eight Eighty-six

Ninty Eighty-four

98

Concept of Place Value. Number

Complete as shown below.

Abacus Place value chart Number name

Abacus Tens Ones Eighty-one 81
81 Number name Number

Place value chart

Abacus Tens Ones Number name Number
82

Place value chart

Abacus Tens Ones Number name Number
83

Place value chart

Abacus Tens Ones
84

Place value chart Number name Number

Tens Ones 99
85

Mathematics 1

Abacus Place value chart Number name Number

Tens Ones
86

Abacus Place value chart Number name Number

Tens Ones
87

Abacus Place value chart Number name Number

Tens Ones
88

Abacus Place value chart Number name Number

Tens Ones
89

Abacus Place value chart Number name Number

Tens Ones Mathematics 1
90

100

Numbers from 91 to 100.

See, Learn and Understand. Ninety-six

Ninety-one

91 96

Ninety-two Ninety-seven

92 97

Ninety-three Ninety-eight

93 98

Ninety-four Ninety-nine

94 99

Ninety-five Hundred

95 100

Mathematics 1 101

Write the name of numbers. Write the
missing
93 99 numbers.
91 92
95 94 91
97 98
96 100 94

Write the numbers. 96

Ninety-one Ninety-nine 98

Ninety-five Ninety-two 100

Ninety-seven Ninety-three Mathematics 1

Ninety-eight Ninety-six

Hundred Ninety-four

102

Concept of Place Value. Number

Complete as shown below.

Abacus Place value chart Number name

Abacus Tens Ones Ninety-one 91
91 Number name Number

Place value chart

Abacus Tens Ones Number name Number
92

Place value chart

Abacus Tens Ones Number name Number
93

Place value chart

Abacus Tens Ones
94

Place value chart Number name Number

Tens Ones 103
95

Mathematics 1

Abacus Place value chart Number name Number

Tens Ones
96

Abacus Place value chart Number name Number

Tens Ones
97

Abacus Place value chart Number name Number

Tens Ones
98

Abacus Place value chart Number name Number

Tens Ones
99

Abacus Place value chart Number name Number

Tens Ones Mathematics 1
10 0

104

3Unit

Concept of Pairing of
Numbers

Identifying Features of
Numbers.

Identification of greater, smaller
and equal numbers
Concept of even and odd
numbers
Concept of ordinal numberst

Teaching Materials 105

Objects used in our daily life
Objects in our surroundings
Comparison of position of numbers

Mathematics 1

Greater and Smaller Numbers

See, observe and learn.

Bicycle Motor bike Car

I am smaller I am smaller I am greater
than both. than a car and than both.
greater than a

bicycle.

20 10 10 20

Greater Side Smaller Side Greater Side

Greater than Smaller than

106 Mathematics 1

Count the objects in box and write down greater
than or less than in the blanks.

3

2
3 is greater than 2

Mathematics 1 107

Write down greater than or less than.

35 15 17

3 is less than 5

12 25 37 36

21 36 45 63

55 43 18 34

108 Mathematics 1

Equal Numbers

See, feel and learn.

Equal to

=

4 is equal to 4
In symbol,
4=4

Equal to

15 = 15

55 = 55 18 = 18

Mathematics 1 109

Circle the symbol that makes each comparison
correct.

Greater than 6
5 equal to

less than

Greater than 4
8 equal to

less than

Greater than 11
11 equal to

less than

18 Greater than 20
equal to
110 less than Mathematics 1

Identify and write as shown. Test Yourself.

15 is greater than 10

49

19 19 5 is lesser than 8

75 57 4 4

81 84

83

35 33

56 40 12 21

78 18 81 18

25 25

39

47 40

65 56 10 17

20 30 9 9
100
99 111
Mathematics 1

Ordinal Numbers

Observe and answer the followings.

Entrance

Computer

Which stall is in the first place?

Which stall is in the third position? Books

Which stall is in the last place?

Which position shows the books stall? Stationary

Exit Food Communication

112 Mathematics 1

Write down the name of students according to roll
number of your class.

Count from the left, write the ordinal number.

1) Position of umbrella is 113

2) Position of flag is
3) Position of spectacles is
4) Position of pen is
5) Position of apple is
6) Position of tree is

Mathematics 1

Odd and Even Numbers

Concept of odd and even number.

1 odd

2 even

3 odd

4 even

5 odd

6 even

114 Mathematics 1

Mathematics 1 7 odd
8 even
9 odd
10 even
11 odd
12 even

115

Write down odd and even numbers from the followings.
By pairing the objects

4 even
Removing two objects

116 Mathematics 1

Write down the odd and even below the
following numbers.
11 14 21 28

12 93 71 42

41 60 61 30

50 43 78 29

Write down any five odd numbers.

Write down any five even numbers. 117

Mathematics 1

Number Before and After

I can write the position of given pictures.

Zebra is elephant.
Giraffe is tiger.
zebra.
Elephant is

What comes just before ?

89 15 29

25 30 14

118 Mathematics 1

What comes just after ? 19

16 17 5

56 25 35

What comes in between?

15 16 17 15 17

8 10 50 52

18 20 35 37

Mathematics 1 119

Ascending Order and
Descending Order

See, feel and learn. Descending Order
Ascending Order 5
4
1 3
2 2
3 1
4
5

In ascending order, we
write the numbers from
smaller to greater.

In descending order, we
write the numbers from

greater to smaller.

120 Mathematics 1

Write the numbers in ascending order.

a) 14, 18, 19, 25, 36

b) 69, 56, 74, 25, 52

c) 35, 48, 20, 44, 65

d) 32, 21, 73, 98, 41

Mathematics 1 121

Join the numbers in correct order, and colour the picture.

122 Mathematics 1

4Unit

Basic Operations

Identifying Addition, Subtraction
and Devanagari

To add the numbers with and without
carry-over

To subtract the numbers with and
without borrowing

To identify the Devanagari Number
and number names

Teaching Materials Tens Ones

Base ten bolus 123
Tooth picks
Abacus
Place value chart
Mathematics 1

Addition of 2 Digit Numbers

Tens Units

+

At first After that,

add units add tens

1 ten 3 ones 13
12
1 ten 2 ones
25
= 2 tens 5 ones

20 + 5 =

124 Mathematics 1

Adding 2 digit numbers.

Tens Ones 28 Tens Ones +
28 51
+1 1
+1 1 39 +2 8
39

Tens Ones + Tens Ones +
40 23

+3 5 +4 2

Tens Ones + Tens Ones +
73 43

+1 2 +2 1

Tens Ones + Tens Ones +
67 15

+1 2 +4 3

Mathematics 1 125

Tens Ones + Tens Ones +
42 23

+3 5 +4 2

Tens Ones + Tens Ones +
41 43

+3 5 +4 3

Tens Ones + Tens Ones +
46 45

+3 2 +4 2

Tens Ones + Tens Ones +
64 43

+3 5 +2 6

126 Mathematics 1

Addition of 3 digit numbers.

Hundreds Tens Ones 428
4 2 8 +3 1 1
1 1
+3 739
3 9
7

Hundreds Tens Ones
4 2 7
5 1
+5

Hundreds Tens Ones
3 1 2
1 2
+5

Hundreds Tens Ones
7 2 2
5 5
+2

Hundreds Tens Ones
6 4 2
1 4
+3

Mathematics 1 127

Hundreds Tens Ones
2 8 2
1 0
+3

Hundreds Tens Ones
6 2 4
2 5
+3

Hundreds Tens Ones
5 4 4
4 4
+2

Hundreds Tens Ones
8 1 5
7 3
+1

Hundreds Tens Ones
5 4 6
1 2
+3

128 Mathematics 1

Hundreds Tens Ones
5 4 2
2 4
+4

Hundreds Tens Ones
8 7 2
2 2
+1

Hundreds Tens Ones
4 1 4
5 2
+4

Hundreds Tens Ones
6 9 4
0 2
+2

Hundreds Tens Ones
5 4 7
3 2
+4

Mathematics 1 129

Hundreds Tens Ones
4 5 8
2 1
+5

Hundreds Tens Ones
1 2 3
1 6
+8

Hundreds Tens Ones
7 0 3
7 2
+2

Hundreds Tens Ones
5 2 3
1 4
+3

Hundreds Tens Ones
0 6 5
1 3
+8

130 Mathematics 1

Addition of 2 Digit Numbers
with Carry Over

Let's discuss the place value.
5 ones + 7 ones = 12 ones
= 1 ten + 2 ones
8 ones + 6 ones = 14 ones
= 1 ten + 4 ones
Remember 1 ten = 10 ones.

What does it means teacher?
I am not clear.

After adding 5 ones and 7 ones, there will
be 12 ones. Then 2 ones have to be written,
and 1 ten should be taken as carry-over.
Which should be added together with the
number of place value ten.

Oh! I see, 1

2 5 2 5

+ 3 7 + 3 7

= 5 tens 12 ones 6 2

= (5 + 1) tens 2 ones

= 6 tens 2 ones

Yes, you are = 62
absolutely
Is it write teacher?
right.
131
Mathematics 1

Add the followings.

Tens Ones Tens Ones Tens Ones

1 5 4 9 3 8
2 7 + 3 7 + 2 7
+ 3

62

Tens Ones Tens Ones Tens Ones

2 7 3 6 7 8
+ 3 7 + 2 9 + 1 9

Tens Ones Tens Ones Tens Ones

5 5 1 9 3 8
+ 2 5 + 2 9 + 4 5

Tens Ones Tens Ones Tens Ones

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

132 Mathematics 1

Tens Ones Tens Ones Tens Ones

7 9 2 7 1 6
+ 1 5 + 6 3 + 4 5

Tens Ones Tens Ones Tens Ones

5 7 7 6 3 9
+ 1 6 + 2 4 + 1 2

Tens Ones Tens Ones Tens Ones

8 3 7 6 3 4
+ 0 9 + 1 6 + 5 9

Tens Ones Tens Ones Tens Ones

0 9 2 8 9 5
+ 2 3 + 2 4 + 0 9

Mathematics 1 133

Subtraction in Number Line

See, feel and learn.
Start from 10, and move 6 step back.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

10 - 6 = 4
Start from 23, and move 8 step back.

10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

23 - 8 = __
Start from 36, and move 7 step back.

21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38

36 - 7 = __
Start from 57, and move 5 step back.

40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57

57 - 5 = __

134 Mathematics 1

Subtraction from 11 to 19

See, feel and learn.
There are 12 mangoes

I ate 3

mangoes.

12 - 3 = 9 Left mangoes = 9

12 - 5 =__ 14 - 5 =__

15 - 5 =__ 8 - 4 =___

Mathematics 1 135

11 - 6 =__ 15 - 7 =__

18 - 9 =__

20 - 7 =__

136 Mathematics 1

Draw lines, and subtract as shown.

13 - 3 = 10 11 - 3 = 14 - 2 =

11 - 5 = 18 - 5 = 14 - 6 =

17 - 8 = 19 - 4 = 15 - 7 =

11 - 6 = 13 - 4 = 17 - 9 =

13 - 0 = 19 - 6 = 14 - 5 =

Mathematics 1 137

Subtract orally and write. 13 18
–8 –3
11 12
–5 –6 19
–9
6

13 14 17
–4 –6 –9

16 14 13 14
–9 –6 –5 –0

3

16 14 18 12
–7 –4 –8 –5

19 12 14 12
–1 –8 –5 –9

3

138 Mathematics 1

Addition and Subtraction

See, feel and learn.
4
+

33

– 15
7 +
3
Complete the following.
–
8
+ 139

3

–
11

Mathematics 1

6 12
+ +

– –
10
9 4
+ +
3
–
–
5
+ 3
6 +

– –
4
140
Mathematics 1

Subtraction of Two Digit
Numbers (without borrowing)

See, feel and learn.

There are 3
= columns of each

10 Cubes,
and 4 other
cubes = 34

34 – 12 = 22 One column and 2
cubes are shaded,
and taken out = 12

cubes

I understood,
remaining 2 columns and

2 cubes = 20 + 2 = 22

Alternative

Ten Ones

3 4 At first, subtract the ones

–1 2 After that subtract the tens.

22

Mathematics 1 141

Subtract Ten Ones Ten Ones Ten Ones
78 69 33
Ten Ones
45 –8 3 –2 6 –2 1

–2 3 Ten Ones Ten Ones Ten Ones
22 79 36 25

Ten Ones –6 1 –2 5 –2 2
44

–1 1

Ten Ones Ten Ones Ten Ones Ten Ones
98 88 78 67

–6 5 –7 6 –1 5 –1 6

Ten Ones Ten Ones Ten Ones Ten Ones
53 59 87 68

–0 2 –1 3 –6 7 –1 5

Ten Ones Ten Ones Ten Ones Ten Ones
56 66 57 21

–2 4 –1 1 –1 6 –1 1

Ten Ones Ten Ones Ten Ones Ten Ones
28 39 68 77

–1 4 –2 4 –1 4 –1 3

142 Mathematics 1

Ten Ones Ten Ones Ten Ones Ten Ones
34 26 69 87

–1 3 –1 4 –6 1 –1 3

Ten Ones Ten Ones Ten Ones Ten Ones
42 82 35 38

–1 1 –6 1 –1 2 –3 1

Ten Ones Ten Ones Ten Ones Ten Ones
34 49 64 48

–1 2 –3 6 –1 3 –2 7

Ten Ones Ten Ones Ten Ones Ten Ones
92 65 53 26

–4 0 –2 3 –4 2 –4 3

Ten Ones Ten Ones Ten Ones Ten Ones
83 28 54 32

–1 2 –1 6 –1 1 –1 1

Ten Ones Ten Ones Ten Ones Ten Ones
78 66 99 43

–5 4 –5 4 –4 4 –2 2

Mathematics 1 143

Subtract 44 – 32 = 66 – 25 =
78 – 16 =
15 – 11 = 4 56 – 23 =
87 – 56 =
27 – 15 = 38 – 15 = 45 – 32 =
62 – 10 =
88 – 10 = 35 – 14 = 56 – 24 =
99 – 25 =
37 – 10 = 29 – 13 =
Mathematics 1
44 – 33 = 67 – 36 =

67 – 36 = 45 – 32 =

99 – 34 = 83 – 71 =

29 – 9 = 54 – 42 =

144

Word Problems on Subtraction

See, feel and learn.
Pratik had 12 pencils. He lost 5 pencils. Now, how many
pencils has he got ?

12 – 5 = 7

Neelam had 10 balloons. 7 balloons fly away. How many
balloons does she have?

10balloons She has 3 balloons.

– 7 balloons 145
3 balloons

Mathematics 1

Solve the problem 15 balloons
– 5 balloons
Jitu has 15 balloons, 5 of ___ balloons
them burst. How many
balloons are left? 14 balls
– 6 balls
15 – 5 = ___ balls
Jitu has _____ balloons left.
18 mangoes
Pemba has 14 balls. He lost – 9 mangoes
6 of them. How many balls ___ mangoes
are left?
Mathematics 1
14 – 6 =
Pemba has _____ balls left.

Pratibha has 18 mangoes.
She has eaten 9 of them.
How many mangoes are left?

18 – 9 =
Pratibha has _____
manoges left.

146