Explain how to find all the factors pairs of 40

If you want you can do what i do.
first find all the numbers divisible by 40 in order. which would be:
1 2 4 5 8 10 20 40.
if you write it down you can make a rain bow and connect the first number to the last number. and so on. so the pair factors of 40 would be. 1&40 2&20 4&10 & 5&8

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)