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!
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Write down 40 and 1. Divide by two. Write down 20 and 2. Divide by two. Write down 10 and 4. Divide by two. Write down 5 and 8. Stop.
(40,1)(20,2)(10,4)(8,5)
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)
1 x 16 2 x 8 4 x 4
The greatest common factor of 160 and 200 is 40.
The factors of 40 are 1, 2, 4, 5, 8, 10, 20 and 40 64 is not divisible by 10, 20 or 40. So 8 is the greatest common factor of 40 and 64. Then testing 8 against 96, we find that it is a factor (8 x 12 = 96) Therefore 8 is the greatest common factor of these three numbers.