Grade 1 Number Sense Session 3

Smallest to Biggest

Increasing Order

Biggest to Smallest

Decreasing Order

Ascending

order

Descending

order

Ascending order of the numbers

2, 4, 1, 3 is 1, 2, 3, 4

Arrangement of

numbers from smaller

to bigger

1

2

3

Ascending order

ASCENDING ORDER

Descending order of the numbers

3, 9, 2,7 is 9, 7, 3, 2

Arrangement of

numbers from bigger

to smaller

DESCENDING ORDER

3

2

7

9

Descending order

What is skip counting ?

● Skip counting means to count by a number other than one

● By skip counting , you are able to count things faster

● Skip counting also helps to learn multiplication

0 1 2 3 4 5 6 7 8 9 10 11 12

13 14 15

+2 +2 +2 +2 +2 +2

+2

Skip Counting

Count by

2s

2 4 6 8 10 12

0 1 2 3 4 5

3 4 5 6 7 8

5 6 7 8 9 10

Expanded

Form

Skip Counting

by 2’s

Skip Counting

by 3’s

Numbers

Place Value

Ones Place

Tens Place

Number puzzles help
make Maths enjoyable

NUMBER PUZZLES

Mathematical

Reasoning

B

A

C
D

Question 1

Which number line shows jump of frog by 3’s?

ANSWER

Option

D

Explanation

Figure given in option (D), the frog started from 0 and jumped to 3

Then, from 3, it jumped 3 places ahead that is to number 6

So, the number line given in option (D) shows jump of frog by 3’s

B

A

C
D

Question 2

Counting backward or counting down from thirteen,

which one of the following numbers comes next?

12

13

11

14

ANSWER

Option

A

12

Explanation

If we count backwards or count down from thirteen, the

numbers will be

13, 12, 11, …

So, the next number after 13 will be 12

B

A

C

D

Question 3

Which number will come in place of (?) in skip counting of 2’s?

Thirty two

Thirty two

Thirty

Twenty five

2

10

20

26

34
?

ANSWER

Option

B

Thirty

Explanation

After 20, we need to skip 5 places by 2

So, 20, 22, 24, 26, 28, 30

B

A

C

D

Question 4

The ascending order of the given numbers is

7

3

5

4

4

3

5

7

7

5

4

3

5

4

7

3

7

5

3

4

ANSWER

Option

B

7

5

4

3

Explanation

Here, 3 < 4 < 5 < 7

So, the ascending order of 7, 3, 5, 4 is

3, 4, 5, 7

Question 5

A girl jumps 4 steps from 0 and then 3 steps. Where will

she reach?

B

A

C

D

6th point

8th point

7th point

5th point

ANSWER

Option B
7th point

Explanation

In first 4 steps from 0, the girl will reach at 4th point

In second 3 steps, the girl will reach at (4 + 3) = 7th point

Question 6

What shows this number line?

B

A

C

D

Counting by 2’s

Counting by 1’s

Counting by 4’s

Counting by 5’s

ANSWER

Option B

Counting by 4’s

Explanation

Here,

0 + 4 = 4

4 + 4 = 8

8 + 4 = 12

So, the given number line shows the counting by 4’s

Question 7

Which abacus shows the number just after 56?

B
A

C

D
T
O

T
O

T
O

T
O

ANSWER

Option C

T
O

Explanation

Abacus A shows 55

Abacus B shows 56

Abacus C shows 57

Abacus D shows 48

Hence, the number comes just after 56 is 57

A

T
O

B

T
O

C

D

T
O

T
O

Question 8

The number comes just before the number shown below

on the abacus is

B

A

C

D

T
O
Forty three
Forty six

Forty four
Forty five

ANSWER

Option B
Forty six

Explanation

There are 4 beads shown at tens place and 7 beads at ones

place

So, the number formed is 4 tens and 7 ones = 47

The number that comes just before 47 is 46 (forty six)

Question 9

Which of the following shows the ascending order of

numbers given on this sheet?

B

A

C

D

32, 5, 15, 43
5, 15, 32, 43

5, 15, 43, 32
15, 5, 32, 43

32

15

5

43

ANSWER

Option B

5, 15, 32, 43

Explanation

Here,

5 < 15 < 32 < 43

So, the numbers in ascending order is 5, 15, 32, 43

Question 10

Which one of the following numbers will come in place of

question mark (?) in the pattern given below?

B

A

C

D

14
15

16
24

12

21

9

0

6

3

?18

ANSWER

Option B

15

Explanation

Numbers are 0, 3, 6, 9, 12, 15, 18, 21, 24

(Skip counting by 3’s)

So, the required missing number is 15

Archivers Section

(HOTS)

Question 11

What comes in place of question mark (?)

B

A

C

D

70
72

64
78

ANSWER

Option B

72

Explanation

On looking at the numbers

76 + 4 = 80

80 + 4 = 84

Skip counting by 4’s

Hence, the required number is 68 + 4 = 72

Question 12

Arrange the following numbers in descending order

B

A

C

D

X, W, Y, Z
Z, X, Y, W

Z, X, W, Y
Y, X, W, Z

2 tens 7 ones

4 tens 8 ones
2 tens 1 ones

5 tens 9 ones
w

x

Y

Z

ANSWER

Option C
Z, X, W, Y

Explanation

W = 27

X = 48

Y = 21

Z = 59

59 > 48 > 27 > 21

So, the required descending order is Z, X , W, Y

Question 13

Which one of the following groups of numbers is in descending

order?

B
A

C
D

11

10

12

10

9

8

7

6

8

11

9

10

ANSWER

Option B

10

9

8

Explanation

In option (A)

11, 10, 12 are not in descending order

In option (C)

7, 6, 8 are not in descending order

In option (D)

11, 9, 10 are not in descending order

But in option (B)

10, 9, 8 are in descending order

Question 14

Arrange the given numbers in ascending order

B

A

C

D

R, P, Q, S
R, P, Q, S

P, S, Q, R
P, R, Q, S

Thirty Four

Forty Three
Thirty Five

Fifty Three
P

Q

R

S

ANSWER

Option D
P, R, Q, S

Explanation

P : Thirty Four = 34
Q : Forty Three = 43
R : Thirty Five = 35
S : Fifty Three = 53

So, 34 <35 < 43 < 53

Or, P < R < Q < S

Question 15

Identify the number

B

A

C

D

52
34

45
43

●It is a 2-digit number

●The sum of its digits is 7

●It lies between 40 and
50

ANSWER

Option D

43

Explanation

Sum of digits of 52 is 7 which is greater than 50

Sum of digits of 34 is 7 which is smaller than 40

Sum of digits of 45 is 9 Sum of digit of 45 is 9

Now, the sum of digits of 43 is 7 and 43

And, 43 lies between 40 and 50