Math 1

Long and Short

Long rope Short rope

Long ribbon Short ribbon

Tick () the longer object and cross (×) the shorter one.

Oasis School Mathematics Book-1 51

Write the numbers from 1 to 4 (shortest line to longest line)

Number these from shortest to longest.

Colour the scarves.

The yellow scarf is the longest one.
The red scarf is the shortest one.
The blue scarf is longer than red scarf.

52 Oasis School Mathematics Book-1

Measurement of object using body parts

Footspan Cubit Fingers Footstep Handspan

Which one of a above is suitable to measure the length of given object::
Your bench ...........................................
White board ............................................
Pencil ............................................
Book ............................................
Length of the classroom ............................................

Measure the following objects inside your classroom.

Cubit Footspan

Handspan Cubit

Oasis School Mathematics Book-1 53

Measure the following objects in your house.

Handspan Cubit

Cubit Footspan

Handspan Footstep
Write the measurement of the following.
Your playground to your classroom. footstep
Length of your classroom. footspan
Length of your Basketball court. footstep
Length of your playground. footspan
Length of your desk. cubit

54 Oasis School Mathematics Book-1

Activity Observe the following objects of your
surrounding

Tick (√) the bigger object.

Buffalo Goat

Tick (√) the smaller object.

Bus Mobile sets

Tick (√) the taller one.

Your father Your mother

Tick (√) the shorter object.

Your bed Chair

Tick (√) the longer object.

Television Your copy

Tick (√) the heavier object.

Television Mobile

Tick (√) the lighter object.

Flower Table

Which body part is better to measure the length of your dinning table?



Which body part is better to measure the length of a pen?


Oasis School Mathematics Book-1 55

Heavy and Light

This stone is heavy. This stone is light.

This bottle is light. This jar is heavy.

Tick () the heavier object and cross (×) the lighter one.

56 Oasis School Mathematics Book-1

Unit Evaluation Full Marks : 8

1. Write L for long object and S for shorter one. 2

2. Write T for taller object and S for the shorter one. 2

3. Tick () the bigger object. 2

4. Write L for lighter object and H for heavier object. 2

Oasis School Mathematics Book-1 57

Our
Community

Contents
• Addition and Subtraction of Numbers upto 10
• Addition of Numbers upto 20
• Odd and Even Numbers
• Numbers upto 100

58 Oasis School Mathematics Book-1

Addition and Subtraction of Numbers upto 10

Complete as shown.

and is and is
2 +3=5 +=

and is and is
+= +=

and is and is
+= +=

and is and is
+= +=

Oasis School Mathematics Book-1 59

Count forward to add

Look and learn.
1 2 3 4 5 6 7 8 9 It’s interesting.

Add: 2 + 3
To add 2+3, keep your finger at 2 and then move
the finger 3 steps forward. You will reach 5.
2+3=5

Count forward and add

3+2= 6+3= 7+2= 7+2=

5+3= 5+2= 6+2= 6+2=

4+3= 2+4= 2+1= 2+1=

Adding one
While adding one write the number that comes just after.

1+1= 2+1= 3+1= 4+1=

6+1= 7+1= 8+1= 9+1=

Adding two

Adding three 3+3 = 4+3 =
2+3 = 1+3 =
6+3 = 7+3 =
5+3 =

60 Oasis School Mathematics Book-1

How many are there altogether?

Write in mathematical sentence as shown.

3 apples and 5 apples are mixed 3 pencils and 4 pencils are kept
together. together.

3+5=8 4 birds and 2 birds are kept
together.
7 balls and 2 balls are mixed
together.

7 bananas and 3 bananas are 2 books and 3 books are mixed
mixed together. together.

Oasis School Mathematics Book-1 61

Addition of Numbers with Zero

I remember!

Any number plus
zero given the same

number.

There are 5 balls on There is no ball
the tray. on the tray.

Altogether how many balls are there?

There are 5 balls altogether.

∴5 +0 =5

Complete as above

+=

+=
+=

+ =

62 Oasis School Mathematics Book-1

Addition on Number Line

Look and learn.

Add by using number line:

3+2

0 1 2 34 5 6 7 8 9

Point your pencil at 3 and jump 2 steps 3+2 = 5
forward. You will reach 5.

Complete as above. 4+2 =
4+2 2+4 =
1+5 =
0 1 2 34 5 6 7 8 9 2+6 =

2+4

0 1 2 34 5 6 7 8 9

1+5

0 1 2 34 5 6 7 8 9

2+6

0 1 2 34 5 6 7 8 9

4+4 4+4 =

0 1 2 34 5 6 7 8 9

5+3 5+3 =

0 1 2 34 5 6 7 8 9

Oasis School Mathematics Book-1 63

Subtraction up to 10 6

Look and learn. -4

There were 6 bananas. 2
We ate 4.
How many are left? 7
-5
4 taken away from 6 is 2
Mathematically,
6–4 = 2
Cross out to find the answer and fill in the boxes:

3
-2

6
-3

5
-1

64 Oasis School Mathematics Book-1

Cross out the object to find the answer.

6–2=
9–5=
8–1=

8–5=

7–4=
5–4=

7–7=
4–3=

3–0=
2–0=

Oasis School Mathematics Book-1 65

Count backward to subtract

Look and learn.

12 3 4 5 6 17 8 9

Subtract: 7 – 3
To find 7–3, keep your finger at 7 and then move
your finger 3 steps backward. You will reach 4.

∴7–3=4

Count backward and subtract

66 Oasis School Mathematics Book-1

Solve the following verbal problems:
There are 9 boys and 7 girls. How many more boys are there than girls?

How many more? 2 9 –7 =2

There are 7 girls and 4 balls? How many girls are more than balls?

How many more? –=

There are 7 benches and 2 tables in your classroom? How many
benches are more than tables?

How many more? – =

There are 8 chairs and 5 boys in class. How
many more chairs are there than boys?

How many more? –= To the teacher

Give similar type
of questions ,

using how many
less?

Oasis School Mathematics Book-1 67

Subtraction on number line

Look and learn.

5–3

0 1 2 34 5 6 7 8 9

Point your pencil at 5 and jump 3 steps 5–3 = 2
back. You will reach at 2.

Complete as above. 6–3 =
5–4 =
6–3 8–3 =
7–4 =
0 1 2 34 5 6 7 8 9 9–5 =
8–4 =
5–4

0 1 2 34 5 6 7 8 9

8–3

0 1 2 34 5 6 7 8 9

7–4

0 1 2 34 5 6 7 8 9

9–5

0 1 2 34 5 6 7 8 9

8–4

0 1 2 34 5 6 7 8 9

7–3 7–3 =

0 1 2 34 5 6 7 8 9

68 Oasis School Mathematics Book-1

Solve the following problems as shown. Circle 5 balls and
count how much left?

Write the number of
remaining balls on

the box.

8— =5

10 — =4

9— =6
—
=8
7— =4
5— =3

Oasis School Mathematics Book-1 69

Number Combinations

Look and learn.

Count the boxes of two different colours and find the Number
Combinations.

Number Combinations of 4

4 + 0 =
3 + 1 =
....... + ....... =
....... + ....... =
....... + ....... =

70 Oasis School Mathematics Book-1

Number Combinations of 5

Count the boxes of two different colours and find the number
combinations of 5.

Number Combinations of 6

Count the number of boxes of two different colours and find the number

combitions of 6. Yellow Blue Total

6 +0 =6

+=

+=

+=

+=

+=

+=

Oasis School Mathematics Book-1 71

Number Combinations of 7

Count the number of red and yellow triangles to find the number
combinations of 7.

Red Yellow Total

7 +0=7

+=

+=

+=

+=
+=

+=
+=

Number Combinations of 8
Colour the given boxes using two different colours to find the number
combinations of 8.

8+0=8

7+1=8

72 Oasis School Mathematics Book-1

Number Combinations of 9
Use two different colours to find the number combinations of 9.

9 + 0 = 9
8 + 1 = 9

+ =
+ =
+ =
+ =
+ =
+ =
+ =
Number Combinations of 10

Use two different colours to find the number combinations of 10.
10 + 0 = 10
9 + 1 = 10

Oasis School Mathematics Book-1 73

Complete the following.

Lets be clear with the help of given example;

5+ =9 My logic!

Count forward from 5 to 9. I have to count all the
numbers from
5 to 9.

6, 7, 8, 9 4

Required number is 4.

Hence, 5 + 4 = 9

3+4 = 7 2+ =7

+4 = 6 4+ =9

+5 = 9 +3=7
+1=7
7+ = 10

8+ =9 6+ =8

+5 = 7 8+ = 10
+6 = 7 7+ =7

5+ =6 +1=5

74 Oasis School Mathematics Book-1

Complete the following.

Lets see one more example;

8– = 5 My logic!

Count backward from 8 to 5. I have to count all the
numbers from
5 to 8.

7, 6, 5 3

Hence, 8 – 3 = 5

9– =6 5– =2
7– =4
7– =3 5– =1
5– =2 8– =2
8– =5
8– =7 6– =4
3– =1
4– =2 7– =2
4– =0
10 – =8

3– =2

4– =1

5– =3

Oasis School Mathematics Book-1 75

Complete the Complete as above: –6=2
following. –4=7 –1=7
–5=6 –4=9
– 3 = 5. –3=5 –6=8
–4=7 –3=7
Count 3 steps forward –2=5
from 5. 4=8
Hence the required
number is 8. 6
+
Number Puzzle 2
=
Complete the given number puzzle.
=7
2 +2 = +

++

15

==

3 +=
++
2 +=
= =+

+ =7 +

+=

6+ =9

=

8

76 Oasis School Mathematics Book-1

Activity Colour the path to get 8 in each station.

3+5 2+4 3+1 0+5 7+3

7+1 2+6 4+4 6+2 3+1

3+2 5+1 5+4 7+1 10–2

1+1 4+0 8+0 6+3 9–1

Colour the path to get 5 in each station. 0+0 1+4

5+0 4+1 1+1 3+4 1+0

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

3+3 4+2 0+3 4+1 4+6 3+7 2+8
4+2 8–7 5–3 7–2 6–1 9–4 7–3
5–5 6–2 7–4 9–8 9–1 8–3 10–5

Oasis School Mathematics Book-1 77

Subtract the following and colour the given

Worksheet picture according to the given colour code.

84 4
–5 –2 –1

6 7–3= 8
–2 –3
6
6 –1 3
–3 –0
7–5=

2 - orange
3 - blue
4 - green
5 - yellow

78 Oasis School Mathematics Book-1

Colour the boxes of two numbers adjacent

Worksheet to each other horizontally or vertically

whose sum is 10.
Example: 4 + 6 = 10

3461549319
1473521652
7528468173
3645272584
1234567891
5564782312
9761562679
1234349121
6472427357
1258155648

Oasis School Mathematics Book-1 79

Unit Evaluation Full Marks : 10

1. Using number line add the following numbers. 3

0123456789
3+4=

0123456789
5+4=

0123456789 3
2+6=

2. Using number line subtract the following numbers.

0123456789
7–3=

0123456789 2
8–5= 9

3. Count forward and add:

1 2 3 4 5 67 8

2+4= 3+2=

6+3= 5+3=

4. Count backward and subtract: 2
9
1 2 3 4 5 67 8

7–2= 6–3=
9–5= 8–6=

80 Oasis School Mathematics Book-1

Addition upto Number 20

Look and learn.

Add: 8 Keep 8 in mind, keep
+3 3 on hand then count

forward 9, 10, 11.

Look at one more example, Take 7 marbles, keep 6 more
marbles together and count all
7 at a time.
+6
944
13 +7 +8 +5

Add: (Using any method)
48

+6 +5

59652
+6 +4 +5 +8 +7

96879
+8 +3 +6 +7 +3

98769
+3 +4 +6 +4 +5

Oasis School Mathematics Book-1 81

Addition of 3 umbers by making 10 4 + 6 =10 5 + 5 =10
Remember! 9 + 1 =10 10 + 0 =10
1 + 9 =10 2 + 8 = 10 3 + 7 =10

6 + 4 =10 7 + 3 =10 8 + 2 =10

10 + 0 = 10 10 + 1 = 11 10 + 2 =12 10 + 3 =13 10 + 4 =14

10 + 6 =16 10 + 7 = 17 10 + 8 =18 10 + 9 =19 10 + 10 = 20

Addition of 3 numbers by making 10.

5

+6 6 + 4 = 10
+4 10 10 + 5 = 15

15

9 10 9 + 1 = 10 6
+1 7 10
4
+ 7 10 + 7 = 17
17
17

Make 10 and add the following 3 numbers. 9
+1
3456 +6
+7 +6 +8 +1
+4 +2 +2 +4

3214 8 8
+7 +5 +9 +3 +2 +8
+6 +8 +3 +6 +7 +2

82 Oasis School Mathematics Book-1

Addition upto Number 20 13 12
+4 +6
Add:
11 16
11 13 11 +7 +2
+4 +6 +5

14 15 12
+5 +3 +5

Solve the following problems.
There are 6 spoons on the table, 5 more spoons
are added there. Find the total number of spoons
on the table.

My father gave me 5 balloons and mother gave
me 3 more, what is the number of balloons that
I have?

There are 10 goats and 4 cows in my home. What
is the total number of animals in my home?

There are 12 orange trees and 4 mango trees
in my home. What is the total number of fruits
trees in my home?

Oasis School Mathematics Book-1 83

Odd and Even Numbers

Look and learn.

It is a pencil. A pair means two
It is not in pair.
∴1 is an unpaired number. Unpaired number means odd
number. Paired number means

even number.

These are two pencils.
It is a pair of pencils.
∴ 2 is a paired number.

Here are 5 pencils.
One pencil has no pair.
∴ 5 is an odd number.

Here are 8 pencils.
Each pencil has a pair.
∴ 8 is an even number.

84 Oasis School Mathematics Book-1

From the given figure make pairs as shown and identify whether
the given number is odd or even.

Unpaired number is an number.
9 is an odd number.

is an number. is an number.

Fill in the blanks: 5 is an number.
2 is an number. number.
number
3 is an number. 8 is an number.

6 is an number. 9 is an

1 is an number. 4 is an

Write all the even numbers from 1 to 10.

Write all the odd numbers from 1 to 10.

Oasis School Mathematics Book-1 85

Odd and Even Numbers from 11 to 20

Make the pair and identify whether the given numbers are odd or even.

11 Unpaired

odd number.

12 Even number
13

14

15

16
17
18
19

20

86 Oasis School Mathematics Book-1

Odd and Even Numbers from 11 to 20

Let's take number 12. Let's take another number 67.

It has 2 in ones place, which is It has 7 in ones place, which is
even. odd.

∴ 42 is an even number. ∴ 67 is an odd number.

Any number ending in Any number ending in
1, 3, 5, 7, 9 is an odd 2, 4, 6, 8, 0, is an even

number. number.

Write ‘E’ for even number and ‘O’ for odd number.

47 8 8

9 11 10 7

15 17 19 6

20 16 13 5

Write all the odd numbers from 1 to 20.
1

Write all the even numbers from 1 to 20. 20
2

Oasis School Mathematics Book-1 87

Visit 6 different houses of your community and
find their family members and identify whether

Project Work the number is odd or even.

Family 1 Family 2
Number Number

Odd/even Odd/even

Family 3 Family 4
Number Number

Odd/even Odd/even

Family 5 Number
Odd/even
88 Oasis School Mathematics Book-1

Activity Count and write Odd or Even.

The number of fingers in your Even
two hands.

The number of students in
your class.

The number of boys in your
class.

The number of girls in your
class.

The number of windows in
your class.

The number of your family
members.

The number of rooms in your
house.

The number of students
wearing spectacles.

The number of homes in your
community

Oasis School Mathematics Book-1 89

Numbers upto 100

Look and learn.

1 Ten 10 2 Tens 20 3 Tens 30

4 Tens 40 5 Tens 50 6 Tens 60

7 Tens 70 8 Tens 80 9 Tens 90 10 Tens 100

Count tens and write the number

Tens Tens Tens
50

Write the correct number in the box. 4 Tens
8 Tens
1 Ten 10 2 Tens 3 Tens

5 Tens 6 Tens 7 Tens

90 Oasis School Mathematics Book-1

Numbers from 21 to 30

2 Tens and 1 Ones = 21 2 Tens and 2 Ones = 22
Twenty-one Twenty-two

2 Tens and 3 Ones = 23 2 Tens and 4 Ones = 24
Twenty-three Twenty-four

2 Tens and 5 Ones = 25 2 Tens and 6 Ones = 26
Twenty-five Twenty-six

2 Tens and 7 Ones = 27 2 Tens and 8 Ones = 28
Twenty-seven Twenty-eight

Oasis School Mathematics Book-1 91

2 Tens and 9 Ones = 29 3 Tens and 0 Ones = 30
Twenty-nine Thirty

Complete as above:

Tens and Ones = Tens and Ones =

Tens and Ones = Tens and Ones =

Tens and Ones = Tens and Ones =

92 Oasis School Mathematics Book-1

Write the numbers from 21 to 30.

21 29

Complete the following. 20 + 3 =
20 + 6 =
20 + 1 = 20 + 2 = 20 + 9 =

20 + 4 = 20 + 5 =

20 + 7 = 20 + 8 =

Numbers from 31 to 40

3 Tens and 1 Ones = 31 3 Tens and 2 Ones = 32
Thirty-one Thirty-two

3 Tens and 3 Ones = 33 3 Tens and 4 Ones = 34
Thirty-three Thirty-four

3 Tens and 5 Ones = 35 3 Tens and 6 Ones = 36
Thirty-five Thirty-six

Oasis School Mathematics Book-1 93

Complete as above Tens and Ones =
Tens and Ones =

Tens and Ones = Tens and Ones =

Write the numbers from 31 to 40. 39
31

Complete the following.

30 + 1 = 39 + 2 = 30 + 3 =
30 + 6 =
30 + 4 = 30 + 5 = 30 + 9 =

30 + 7 = 30 + 8 =

Write the numbers. Thirty-three
Thirty-one Thirty-six
Thirty-eight

94 Oasis School Mathematics Book-1

Numbers from 41 to 50

4 Tens and 1 Ones = 41 4 Tens and 2 Ones = 42

Fourty-one Fourty-two

Tens and Ones = Tens and Ones =

Tens and Ones = Tens and Ones =

Tens and Ones = Tens and Ones =

Tens and Ones = Tens and Ones =

Oasis School Mathematics Book-1 95

NuNmubmebrserus puptoto5500 Here are 2 Tens and 3 Ones
∴ It is 23
Look and learn.
Twenty-three
Here are 1 Tens and 1 ones.
∴ It is 11.

3 Tens and 4 Ones = 34 4 Tens and 3 Ones = 43
Thirty-four Forty-three

Complete as above:

Tens and Ones = Tens and Ones =

Tens and Ones = Tens and Ones =
Tens and Ones =
Tens and Ones =

96 Oasis School Mathematics Book-1

Write the numbers and number names as shown:

2 Tens + 4 Ones = 24 Twenty-four

3 Tens + 5 Ones =

4 Tens + 2 Ones =
2 Tens + 6 Ones =

3 Tens + 7 Ones =

2 Tens + 7 Ones = 21
3 Tens + 8 Ones = 39
4 Tens + 9 Ones = 46
Write the number names of: 27
21
34
42
50

Read the number names and write the numbers.

Twenty-seven Forty-six

Thirty-nine Twenty-eight

Fifty Forty-one

Twenty-two Thirty-seven

To the teacher

Give similar type of questions for practice in students' copy as Class
Assignment

Oasis School Mathematics Book-1 97

Write the number which comes just before:

22 23 39 47

34 27 40
32
Write the number which comes just after:

20 57 29

47 28 22

30 37 43

Write the number which comes in between:

22 23 24 46 48

29 31 39 41

48 50 28 30

Oral Test

• How many tens are there in 20?
• How many tens are there in 40?
• How many tens and how many ones are there in 27?
• Which number is 1 more than 21?
• Which number is 1 more than 47?
• Which number is 1 less than 23?
• Which number is 1 less than 50?
• Which number is 2 more than 29?
• Which number is 2 less than 27?
• Which number is 2 less than 48?

98 Oasis School Mathematics Book-1

If 20 + 4 = 24, 40 + 7 = 47 then give the answer orally.

20 + 6 40 + 3 30 + 5

20 + 7 10 + 6 30 + 3

40 + 2 40 + 5 30 + 8

20 + 2 20 + 5 10 + 7

Write the numbers from 1 to 50.
1
15

31

Write the numbers from 50 to 1 (counting backward). 50
31
50 1

25
20

Oasis School Mathematics Book-1 99

Worksheet Match the three columns by using same
colour.

34 Forty - seven 4 Tens + 7 Ones

47 Twenty- three 3 Tens + 4 Ones

26 Thirty - four 4 Tens + 0 Ones
2 Tens + 6 Ones
23 Twenty-six 2 Tens + 3 Ones
37 Forty 3 Tens + 7 Ones
40 Thirty-seven

100 Oasis School Mathematics Book-1