because if you divide 40 by 1,2,4,and5 you will get the answer
(and what about 8, 10, 20, and 40 ? are they nothing but chopped liver ?)
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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.
1x6, 2x3
Factor pairs of 42 are 1 x 42, 2 x 21, 3 x 14, and 6 x 7.
1 x 58 = 58 2 x 29 = 58 Therefore, factor pairs = 1 and 58, 2 and 29.
factor pair = 45,1factor pair = 15,3factor pair = 9,5