Question

write all the factors of 28. use commas to separate them.

Explanation:

Step1: Recall factor definition

A factor of a number divides the number evenly.

Step2: Start from 1

$1\times28 = 28$, so 1 and 28 are factors.

Step3: Check 2

$2\times14=28$, so 2 and 14 are factors.

Step4: Check 3

$28\div3=\frac{28}{3}$, not an integer, 3 is not a factor.

Step5: Check 4

$4\times7 = 28$, so 4 and 7 are factors.

Step6: Check numbers greater than 7

Since we have paired up to 4 and 7, and further numbers will be repeats of pairs already found.

Answer:

1, 2, 4, 7, 14, 28