Question

Use divisibility tests to find which of the following numbers are divisible by 11 and 15

a) 17207 b) 946 c) 8820 d)1915​

Answer 1

SOLUTION: divisibility by 11: if the difference between the sum of the digits at odd places and the sum of digits on even places of the number is either 0 or 11 it is divisible by 11

i) 5445

the sum of the odd places 5+4=9

the sum of the even places 4+5=9

9-9=0

since the difference between the sum of the odd places and the sum of even places is 0

it is divisible by 11.

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