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