1 x 40, 2 x 20, 4 x 10, 5 x 8, 8 x 5, 10 x 4, 20 x 2, 40 x 1
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.
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)
Oh, dude, finding factor pairs is like a walk in the park! So, for 40, you just gotta think of numbers that multiply together to give you 40. Like, 1 and 40, 2 and 20, 4 and 10 - you get the idea. It's like a matching game but with numbers. Easy peasy!
80 = 1 x 80 80 = 2 x 40 80 = 4 x 20 80 = 5 x 16 80 = 8 x 10
1 x 16 2 x 8 4 x 4