1x40, 2x20, 4x10, 5x8 are all the factor pairs of 40.
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.
Between 35 and 40, 36 has the most factor pairs.
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 ?)
Divide by two. 40 and 1 20 and 2 10 and 4 5 and 8
Divide by two. 40 and 1 20 and 2 10 and 4 5 and 8
The rules of divisibility tell you that 40 is divisible by 1, 2, 4 and 5. Dividing 40 by those numbers gives you 40, 20, 10 and 8. Writing them together gives you the factor pairs of 40. (40,1)(20,2)(10,4)(8,5)
Divide by two. 40 and 1 20 and 2 10 and 4 5 and 8
Keep dividing by 2 40,1 20,2 10,4 5,8
algebra
I usually start from the bottom - is 2 a factor, yes indeed. Then start over. Is 2 a factor, yes. Start over. Is 2 a factor, yes. Is 2 a factor, no. Is 3 a factor, no. is 4 a factor, no. Done.2, 2, 2, 5
From the rules of divisibility, we know that 40 is divisible by 1, 2, 4 and 5. Divide those numbers into 40 to get the rest. (40,1)(20,2)(10,4)(8,5)