Which of the following numbers is a factor of 18?

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Multiple Choice

Which of the following numbers is a factor of 18?

Explanation:
Determining factors means checking if a number divides 18 exactly, leaving no remainder. A factor of 18 is any number that fits into 18 evenly. For 9, 18 divided by 9 equals 2, an integer, so 9 is a factor. The others don’t divide 18 evenly: 18 ÷ 7, 18 ÷ 13, and 18 ÷ 17 are not integers. Looking at the prime factorization, 18 = 2 × 3², so numbers that are built from these primes in valid combinations are factors, and 9 corresponds to 3², which is indeed a factor.

Determining factors means checking if a number divides 18 exactly, leaving no remainder. A factor of 18 is any number that fits into 18 evenly. For 9, 18 divided by 9 equals 2, an integer, so 9 is a factor. The others don’t divide 18 evenly: 18 ÷ 7, 18 ÷ 13, and 18 ÷ 17 are not integers. Looking at the prime factorization, 18 = 2 × 3², so numbers that are built from these primes in valid combinations are factors, and 9 corresponds to 3², which is indeed a factor.

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