Question

Test the divisibility of the following by 3 and 9. (i) 99999 (ii) 28712 (iii) 12330 :






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Answer 1

Answer:

Divisibility Rule of 3 - If the sum of all the digits of a number is divisible by 3, then the number is divisible by 3.

Divisibility Rule of 9 - If the sum of all the digits of a number is a multiple of 9, then the number is also divisible by 9.

i) 99999

9 + 9 + 9 + 9 + 9 = 45

99999 is divisible by 3 and 9.

ii) 28712

2 + 8 + 7 + 1 + 2 = 20

28712 is not divisible by 3 and 9.

iii) 12330

1 + 2 + 3 + 3 + 0 = 9

12330 is divisible by 3 and 9.

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