Multiply them together.
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Factors come in pairs. If you know one factor, divide it into the number. The answer will be another factor.
The factor pairs of 28 are :28,114,27,4
A way to show factor pairs in a list of all the factors of a number. A factor rainbow can be used to check whether a list of factors is correct.
its a factor with two pairs of the same number
12 has 3 factor pairs and the pairs are (1,12), (2,6) and (3,4).