OUR GNS SOLUTIONS: CBSE Class 3 Mathematics NCERT Solutions Chapter

CBSE Class 3 Mathematics
NCERT Solutions
Chapter – 9
HOW MANY TIMES?

PAGE 122

Leggy Animals

1. How many spiders?

Ans. 3 spiders.
One spider has 8 legs.
In all, spider legs are 3 times 8=24.
3 x 8 = 24.
So, how many legs altogether do octopuos have?
5 x 8 = 40.

PAGE 123

Find the number without counting

2. In the same way, how many bottles are these?

Ans. 4 times 5 = 20 bottles.

3. How many eggs?

Ans. 6 times 5 = 30 eggs.

PAGE 124

Practice time

4. Rewrite using the + sign.

Ans. (a) 2 x 5 times 5 or 5 + 5
4 x 18 times 18 or 18 + 18 + 18 + 18
3 x 20 is 3 times 20 or 20 + 20 + 20
8 x 9 is 8 times 9 or 9 + 9 + 9 + 9 + 9 + 9 + 9 + 9

PAGE 125

5. Ramu bought 4 packets of biscuits. Each packet has 4 biscuits. How many biscuits did Ramu buy?

Ans. 4 x 4 = 16 biscuits.

6. There are 12 desks in a classroom. Each desk has 4 legs. What is the total number of legs of the desk?

Ans. 12 x 4 = 48 legs.

7. Sabiha brought home 3 bunches of flowers. Each bunch has 4 flowers. How many flowers were there?

Ans. 3 x 4 = 12 flowers.

8. One rail coach has 8 wheels. How many wheels in all in 6 coaches?

Ans. 6 x 8 = 48 wheels.

PAGE NO.127

Jump with me

9. Tarru frogs jumps 3 steps each time. Which numbers will Tarru touch?

Ans. 1 x 3 = 3, 2 x 3 = 6, 3 x 3 = 9,
4 x 3 = 12, 5 x 3 = 15, 6 x 3 = 18,
7 x 3 = 21, 8 x 3 = 24, 9 x 3 = 27,
10 x 3 = 30, 11 x 3 = 33, 12 x 3 = 36,
13 x 3 = 39, 14 x 3 = 42, 15 x 3 = 45.

PAGE NO.128

10. Show jumps with 4 steps.

Ans. 1 x 4 = 4, 2 x 4 = 8, 3 x 4 = 12,
4 x 4 = 16, 5 x 4 = 20, 6 x 4 = 24,
7 x 4 = 28, 8 x 4 = 32, 9 x 4 = 36,
10 x 4 = 40, 11 x 4 = 44, 12 x 4 = 48,
13 x 4 = 52, 14 x 4 = 56, 15 x 4 = 60.

PAGE NO.129

11. Try jumps with seven steps.

Ans. 1 x 7 = 7, 2 x 7 = 14, 3 x 7 = 21,
4 x 7 = 28, 5 x 7 = 35, 6 x 7 = 42,
7 x 7 = 49, 8 x 7 = 56, 9 x 7 = 63,
10 x 7 = 70, 11 x 7 = 77, 12 x 7 = 84,
13 x 7 = 91, 14 x 7 = 98, 15 x 7 = 105.

PAGE NO. 131

Shopping with tables

12. How much do these things cost?

(a) 4 toffees cost ______ rupees.

Ans. 4 x 2 = 8 rupees.

(b) 3 pencil cost _____ rupees.

Ans. 3 x 10 = 30 rupees.

Ans. 10 x 10 = 100 rupees.

(d) 9 balloons cost _____ rupees.

Ans. 5 x 9 = 45 rupees.

(e) 5 toys cost ____ rupees.

Ans. 5 x 4 = 20 rupees.

(f) 7 face masks cost _____ rupees.

Ans. 7 x 3 = 21 rupees.

Practice Time

13. Complete the following:

(a) 2 x 7 = ___

Ans. 14.

(b) 3 x 9 = ___

Ans. 27.

Ans. 36.

(d) 5 x 2 = ___

Ans. 10.

(e) 5 x 8 = ___

Ans. 40.

(f) 3 x 10 = ___

Ans. 30.

(g) 10 x 6 = ___

Ans. 60.

(h) 2 x 8 = __

Ans. 16.

(i) 5 x 9 = ___

Ans. 45.

(j) 10 x 8 = ___

Ans. 80.

14. Look at the pattern and complete them.

(a) 3, 6, 9, _________

Ans. 3, 6, 9, 12, 15, 18.

(b) 2, 4, 6, ________

Ans. 2, 4, 6, 8, 10, 12.

Ans. 10, 20, 30, 40, 50, 60.

(d) 4, 8, 12, _______

Ans. 4, 8, 12, 16, 20, 24.

(e) 5, 10, 15, _______

Ans. 5, 10, 15, 20, 25, 30.

(f) 30, 60, 90, _______

Ans. 30, 60, 90, 120, 150, 180.

PAGE NO. 134

How many in all.

15. A shirt has 5 buttons. How many buttons would 3 shirts have?

Ans. 5 x 3= 15 buttons.

16. There are four fans. Each fan has 3 blades. What is the total number of blades in all?

Ans. 4 x 3 = 12 blades.

17. A box contain 6 apples. How many apples in all with seven boxes have?

Ans. 6 x 7 = 42 apples.

18. How many corners would 4 triangles have?

Ans. 4 x 3 = 12 corners.

19. Some multiplication facts:

(a) 8 x 3 = ___

Ans. 24.

(b) 5 x __ = 35

Ans. 7.

Ans. 3 x 4= 12.

(d) __ x 6 = 36

Ans. 6.

(e) 10 x __ = __

Ans. 10 x 5 = 50.

(f) 5 x __ = 40.

Ans. 8.

(g) __ x 9 = 36.

Ans. 4.

(h) __ x __ = 54.

Ans. 9 x 6 = 54.

(i) __ x 7 = 28.

Ans. 4.

20. A flower has five petals. A bunch of flowers has 13 flowers. How many petals are there in the bunch?

Ans. 13 x 5 means 13 times 5.
10 times 5 is 50.|
So, the answer is more than 50.
20 times 5 is 100.
So, the answer is less than 100.

	10	3
5	10 x 5	3 x 5
	50	15

Adding 50 and 15

5	0
+1	5
6	5

So, 13 x 5 = 65.
Thus, there are 65 petals in a bunch.

21. A book has 64 pages. What will be the total number of pages in 8 such books?

Ans. 64 x 8 means 64 is 8
60 times 8 is 480.
So, the answer is more than 480
70 times 8 is 560

	60	4
8	60 x 8	4 x 8
	480	32

Adding 480 and 32

4	8	0
+	3	2
5	1	2

So, 64 x 8 = 512
Thus, there are 512 pages in 8 books.

22. Students stand in rows in the assembly. There are six rows of students. How many students are there?

Ans. 17 x 6 means 17 times 6
10 times 6 means 60
So, the answer is more than 60
20 times 6 means 120
So, the answer is less than 120

	10	7
6	10 x 6	7 x 6
	60	42

Adding 60 and 42

6	0
+4	2
10	2

So, 17 x 6 = 102
Thus, there are 102 students.

23. A design has 3 flowers in it. A piece of cloth has 17 such designs. How many flowers will be on the cloth?

Ans. 20 x 3 = 60
20 times 3 is 60.
So, the answer is less than 60.

	10	7
3	10 x 3	7 x 3
	30	21

Adding 30 and 21

3	0
+2	1
5	1

So, 17 x 3 = 51
Thus, there are 51 flowers on the cloth.

PAGE 141

Practice time

24. First guess the answer and then check it by calculating:

(a) 42

23 = ____

Ans. So, the answer is more than 840.

	40	2
20	40 x 20 = 800	2 x 20 = 40
3	40 x 3 = 120	2 x 3 = 6

Add the numbers

8	0	0
1	2	0
	4	0
	+	6
9	6	6

So, 42 x 23 = 966.

(b) 51 x 13

Ans. So, the answer is more than 510.

	50	1
10	50 x 10 = 500	1 x 10 = 10
3	50 x 3 = 150	1 x 3 = 3

Add the numbers

5	0	0
1	5	0
	1	0
	+	3
6	6	3

So, 51 x 13 = 663.

Ans. So, the answer is more than 730.

	20	5
30	20 x 30 = 600	5 x 30 = 150
6	20 x 6 = 120	5 x 6 = 30

Add the numbers

6	0	0
1	2	0
1	5	0
+	3	0
9	0	0

So, 25 x 36 = 900.

(d) 73 x 11 = ___

Ans. So, the answer is more than 730.

	70	3
10	70 x 10 = 700	3 x 10 = 30
1	70 x 1 = 70	3 x 1 = 3

Add the numbers

7	0	0
	7	0
	3	0
	+	3
8	0	3

So, 73 x 11 = 803.

(e) 54 x 12= ___

Ans. So, the answer is more than 540.

	50	4
10	50 x 10 = 500	4 x 10 = 40
2	50 x 2 = 100	4 x 2 = 8

Add the numbers

5	0	0
1	0	0
	4	0
	+	8
6	4	8

So, 54 x 12 = 648.

(f) 12 x 14 = ___

Ans. So, the answer is more than 120.

	10	2
10	10 x 10 = 100	2 x 10 = 20
4	10 x 4 = 40	2 x 4 = 8

Add the numbers

1	0	0
	4	0
	2	0
	+	8
1	6	8

So, 12 x 14 = 168.

OUR GNS SOLUTIONS

CBSE Class 3 Mathematics NCERT Solutions Chapter – 9 HOW MANY TIMES?