Text Book Back Exercises Questions with Answers, Solution : 4th Maths : Term 1 Unit 3 : Patterns : Exercise 3.2b (casting out of nines method)

__Exercise 3.2b__

**1. ****Circle the correct multiplication
fact (by using casting out nine method).**

**a) 312
× 36 = 11232 **

**b) 723 × 24 = 17508**

**c) 132
× 43 = 5676**

**a) 312 × 36 = 11232**

312
× = __36____11232__

3+1+2 x 0 = 0

6 x 0 = 0

0 = 0

It is correct
multiplication fact.

**b) 723 × 24 = 17508**

3 × 24 = __72__750__1____8__

3x6= 7+5+0

18 = 12

9 ≠ 3

It is not correct
multiplication fact.

**c) 132 × 43 = 5676**

132
× 43 = 5676

1+3+2 x 4+3 = 5 + 6
+ 7 + 6

6 x 7 = 24

42 = 24

6 = 6

It is correct
multiplication fact.

**2. ****Circle the correct division fact
(by using casting out nine method).**

a) __728
÷ 4 = 182__

b) 1580 ÷ 20 = 78

c) __7785
÷ 9 = 865__

**a) 728 ÷ 4 = 182**

8 ÷ 4 = __72__2__18__

8 ÷ 4 = 2

8 = 2 x 4

It is correct
division fact.

**b) 1580 ÷ 20 = 78**

1580
÷ 20 = 78

[1 + 5 + 8] ÷ 2 = 7
+ 8

14 ÷ 2 = 15

5 = 15 x 2

5 = 30

5 = 3

It is not the
correct division fact

**c) 7785 ÷ 9 = 865**

7785
÷ 9 = 865

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

27 ÷ 9 = 19

9 ÷ 9 = 10

9 = 1 x 9

9 = 9

It is the correct division fact

Tags : Patterns | Term 1 Chapter 3 | 4th Maths , 4th Maths : Term 1 Unit 3 : Patterns

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4th Maths : Term 1 Unit 3 : Patterns : Exercise 3.2b (casting out of nines method) | Patterns | Term 1 Chapter 3 | 4th Maths

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