Divisibility by Nine Quiz

What is the rule for determining if a number is divisible by nine?

• The number must be a multiple of three.

• The sum of its digits must be divisible by nine.

• The number must be even.

• The number must end in nine.

Why is the number 18 divisible by nine?

• Because it is a prime number.

• Because the sum of its digits is nine.

• Because it is an even number.

• Because it is less than 20.

What is the remainder when 12 is divided by nine?

• 0

• 2

• 1

• 3

What is the remainder when 5642 is divided by nine?

• 9

• 7

• 8

• 6

Why is 6750 divisible by nine?

• Because it is an odd number.

• Because the sum of its digits is 18, which is divisible by nine.

• Because it ends in zero.

• Because it is a multiple of 100.