Which of the following is NOT a factor of 90?
12
5
6
15
Detailed Explanation
A factor of a number divides evenly into that number without leaving a remainder.
Let's test each option:
15 ÷ 90 = 6 (No remainder, therefore 15 is a factor)
5 ÷ 90 = 18 (No remainder, therefore 5 is a factor)
6 ÷ 90 = 15 (No remainder, therefore 6 is a factor)
12 ÷ 90 = 7.5 (Leaves a remainder of 0.5, therefore 12 is not a factor)
Therefore, the only option that doesn't divide evenly into 90 is 12.
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