Question 1 - Figure it out - Page 126 - Chapter 5 Class 8 - Number Play (Ganita Prakash)

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Question 1 (i) Find, without dividing, whether the following numbers are divisible by 9. (i) 123Now, Sum of digits = 1 + 2 + 3 = 6 6 is not divisible by 9 Since sum of digits is not divisible by 9 ∴ Number 123 is not divisible by 9 Question 1 (ii) Find, without dividing, whether the following numbers are divisible by 9. (ii) 405Now, Sum of digits = 4 + 0 + 5 = 9 9 is divisible by 9 Since sum of digits is divisible by 9 ∴ Number 123 is divisible by 9 Question 1 (iii) Find, without dividing, whether the following numbers are divisible by 9. (iii) 8888Now, Sum of digits = 8 + 8 + 8 + 8 = 32 32 is not divisible by 9 Since sum of digits is not divisible by 9 ∴ Number 8888 is not divisible by 9 Question 1 (iv) Find, without dividing, whether the following numbers are divisible by 9. (iv) 93547Now, Sum of digits = 9 + 3 + 5 + 4 + 7 = 28 28 is not divisible by 9 Since sum of digits is not divisible by 9 ∴ Number 93547 is not divisible by 9 Question 1 (v) Find, without dividing, whether the following numbers are divisible by 9. (v) 358095Now, Sum of digits = 3 + 5 + 8 + 0 + 9 + 5 = 30 30 is not divisible by 9 Since sum of digits is not divisible by 9 ∴ Number 358095 is not divisible by 9