Question

using divisibility test determine which of the following numbers are divisible by 11: (a)7138965 (b)7016930

Answer 1

Answer:

None of them are divisible by 11.

Answer 2

Answer:

The divisibility test for 11 states that take the alternating sum of the digits in the number, read from left to right. If that is divisible by 11, so is the original number.

(a) 7138965

7 - 1 + 3 - 8 + 9 - 6 + 5 = 9, which is not divisible by 11.

Therefore 7138965 is not divisible by 11.

(b) 7016930

7 - 0 + 1 - 6 + 9 - 3 + 0 = 8, which is not divisible by 11.

Therefore 7016930 is not divisible by 11.

Therefore none of the numbers is divisible by 11.