Ncert class 3 maths chapter 9 solutions

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?

1. 4 toffees cost rupees.

Ans. 4 x 2 = 8 rupees.

2. 3 pencil cost rupees.

Ans. 3 x 10 = 30 rupees.

3. 10 pencil boxes cost rupees.
   

Ans. 10 x 10 = 100 rupees.

4. 9 balloons cost rupees.

Ans. 5 x 9 = 45 rupees.

5. 5 toys cost rupees.

Ans. 5 x 4 = 20 rupees.

6. 7 face masks cost rupees.

Ans. 7 x 3 = 21 rupees.

Practice Time

13. Complete the following:

1. 2 x 7 =

Ans. 14.

2. 3 x 9 =

Ans. 27.

3. 4 x 9 =

Ans. 36.

4. 5 x 2 =

Ans. 10.

5. 5 x 8 =

Ans. 40.

6. 3 x 10 =

Ans. 30.

7. 10 x 6 =

Ans. 60.

8. 2 x 8 =

Ans. 16.

9. 5 x 9 =

Ans. 45.

10. 10 x 8 =

Ans. 80.

14. Look at the pattern and complete them.

1. 3, 6, 9,

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

2. 2, 4, 6,

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

3. 10, 20, 30,

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

4. 4, 8, 12,

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

5. 5, 10, 15,

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

6. 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:

1. 8 x 3 =

Ans. 24.

2. 5 x = 35

Ans. 7.

3. 3 x =

Ans. 3 x 4= 12.

4. 6 = 36

Ans. 6.

5. 10 x =
   

Ans. 10 x 5 = 50.

6. 5 x = 40.

Ans. 8.

7. x 9 = 36.

Ans. 4.

8. x = 54.

Ans. 9 x 6 = 54.

9. 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:

1. 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.

2. 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.

3. 25 x 36 =

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.

4. 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.

5. 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

So, 54 x 12 = 648.

6. 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.