Composite numbers have factors that can be listed in pairs. The factor pairs for 720 are (720,1)(360,2)(240,3)(180,4)(144,5)(120,6)(90,8)(80,9)(72,10)(60,12)(48,15)(45,16)(40,18)(36,20)(30,24)
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All of the composite numbers less than 100 have factor pairs.
Only two: (4, 9) and (6, 6). In all other factor pairs, one of the numbers is not composite.
All numbers have factors. Some factors are prime numbers, some are composite numbers. A factor that is a composite number is a composite factor.
Prime numbers have one factor pair. Composite numbers have two or more pairs. (6,8) and (4,12) are two different factor pairs for 48.
The factor pairs of 26 are: 1 × 26 2 × 13