NCERT Grade 8-Playing with Numbers-Questions

NCERT Solutions for Class 8 Maths

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Playing with Numbers

Exercise 1

Find the values of the letters in each of the following and give reasons for the steps involved.

1.     

2.     

3.     

4.    

5.    

6.    

7.   

8.   

9.    

10. 

Exercise 2

11.  If 21y5 is a multiple of 9, where y is a digit, what is the value of y ?

12.  If 31z5 is a multiple of 9, where z is a digit, what is the value of z ?

You will find that there are two answers for the last problem. Why is this so?

13.  If 24x is a multiple of 3, where x is a digit, what is the value of x ?

(Since 24x is a multiple of 3, its sum of digits 6 + x is a multiple of 3; so 6 + x is one of these numbers: 0, 3, 6, 9, 12, 15, 18, …. But since x is a digit, it can only be that 6 + x = 6 or 9 or 12 or 15. Therefore, x = 0 or 3 or 6 or 9. Thus, x can have any of four different values.)

14.  If 31z5 is a multiple of 3, where z is a digit, what might be the values of z?

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