Question

Activity 1.1 Identify mentally whether or not each larger number is divisible by the smaller number. Write “Yes” if the number is divisible, and “No” if it is not.

1) Is 125 divisible by 2? 6) Is 255 divisible by 10?
2) Is 420 divisible by 5? 7) Is 105 divisible by 5?
3) Is 230 divisible by 2? 8) Is 1000 divisible by 10?
4) Is 556 divisible by 5? 9) Is 208 divisible by 5?
5) Is 348 divisible by 2? 10) Is 980 divisible by 10?

Activity 1.2 Find which among 2, 5 and 10 is a common factor of the following pairs of numbers.

1) 10 and 55
2) 60 and 40
3) 92 and 70
4) 145 and 180
5) 230 and 120

Answer 1

Answer:

1) no. 6) no

2) yes. 7) yes

3) yes. 8) yes

4) no. 9) no

5) yes. 10) yes

Answer 2

Given :  

1) Is 125 divisible by 2? 6) Is 255 divisible by 10?

2) Is 420 divisible by 5? 7) Is 105 divisible by 5?

3) Is 230 divisible by 2? 8) Is 1000 divisible by 10?

4) Is 556 divisible by 5? 9) Is 208 divisible by 5?

5) Is 348 divisible by 2? 10) Is 980 divisible by 10?

To Find :  Yes , No   without actual division

Solution:

Number are Divisible by 2 if unit digit is divisible by 2

Means unit digit is 0 , 2 , 4 , 6 or 8

Number are Divisible by 5 if unit digit is divisible by 5

Means unit digit is 0 , 5

Number are Divisible by 10 if unit digit is 0

1) Is 125 divisible by 2    - NO

2) Is 420 divisible by 5 - YES

3) Is 230 divisible by 2   YES

4) Is 556 divisible by 5    NO

5) Is 348 divisible by 2    YES

6) Is 255 divisible by 10   NO

7) Is 105 divisible by 5    YES

8) Is 1000 divisible by 10   YES

9) Is 208 divisible by 5     NO

10) Is 980 divisible by 10   YES

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