Question

Which of the following is a common multiple of 4 and 10?

A 100
B 104
C 90
D 110

Answer 1

A) 100

Explanation:

When looking for a common you can move up the times tables of each number until you find a matching pair. 10x10=100 and 4x25=100. By looking for common answers through the times tables you can more easily find a common multiple.

Answer 2

A 4x25=100 10x10=100 making 100 a common multiple of 4 and 10.