3 and 5
15 3,5 Not much of a tree. More like a factor shrub.
15 3, 5
15 3,5
5,3
Because 45 is not a factor of 60.
The factor tree of 225 is: 15, 15 3, 5, 3, 5 225 75,3 25,3,3 5,5,3,3
225 15 15 3 5 3 5 The factors of 225 are 3, 3, 5, and 5. A common factor is one common to each of two or more numbers. There is not greatest common factor when only one number is given.
15 23
It is: 3 times 5 = 15
Divide top and bottom by any common factors of them. Dividing by the highest common factor of the top and bottom numbers results in the simplest form. hcf(12, 15) = 3, so divide top and bottom by 3: 12/15 = (12÷3)/(15÷3) = 4/5
The greatest common factor of the numbers 63 and 15 is 3.
to find the answer, you should make a factor "tree". Draw it as I explain it. 75 "branches" down to 5 & 15 (because 5 x 15=75) 5 will not "branch" any lower (because the only # you can divide it by is 1 or 5) 15 branches down to 5 & 3 at the bottom of your "branches" you will have two 5's and one 3. The factors for 75 are 1, 3, 5 & 75. (#1 and the number in question will always be factors, in addition to the numbers at the bottom of your factor tree) Prime factorization can be written as 3x5x5 or 3x5 squared. Hope that helps.