its a factor with two pairs of the same number
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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.
The factor pairs of 28 are :28,114,27,4
12 has 3 factor pairs and the pairs are (1,12), (2,6) and (3,4).
The factor pairs of 20 are pairs of numbers that can be multiplied together to give 20. The factor pairs of 20 are (1, 20), (2, 10), and (4, 5). These pairs represent all the possible combinations of numbers that can be multiplied to equal 20.
(16,1)(8,2)(4,4)