By the rules of divisibility, you know that 40 is divisible by 1, 2, 4 and 5. Dividing those numbers into 40 gives you the rest.
(40,1)(20,2)(10,4)(8,5)
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Explaining how to find all factors pairs of 40 is easy. All you have to do is find which whole numbers 40 can be divided into.
A simple way to find the common factors of any set of numbers is to find all the factors of each one. For example: Let A be all the factors of 24. Let B be all the factors of 32. Let C be all the factors of 40. A = {1,2,3,4,6,8,12,24} B = {1,2,4,8,16,32} C = {1,2,4,5,8,10,20,40} So now we find the intersection (that is all the numbers that are common in all of the sets) of all three sets of factors. A∩B∩C = {1,2,4,8} Therefore, the common factors of 24, 32 and 40 are 1, 2, 4 and 8.
Common factors of 24 and 40 are: 1, 2, 4, and 8.
2 and 5
Two of the factors of 40 are odd. The factors of 40 are: 1, 2, 4, 5, 8, 10, 20, 40