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38 votes
38 votes
What is the gcf of 36 and 90

User Ratih
by
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1 Answer

28 votes
28 votes
Just pick a number, divide and see if you can factor even more.
Since both are even numbers, choose an even number that both divide by.
Like 6

36/6 = 6
90/6 = 15

Can you factor 6 and 15 even more? Yes, by 3
6/3 = 2
15/3 = 5

Can you factor 2 and 5? No, that’s it.

So GCF is 6 * 3 = 18

Lets check:
36/18 = 2
90/18 = 5

Can you factor 2 and 5 even further? No, that’s it

So GCF is indeed 18

User Tsury
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3.4k points