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Q: Which numbers are at the bottom of the factor tree of 15?

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15 3,5 Not much of a tree. More like a factor shrub.

15 3,5

5,3

15 3, 5

15 3,5

No. 15 has a factor of 15 but not a factor of 2.

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

15 3,5 21 3,7

A common factor of the numbers 25 and 15 is the number five.

All numbers have factors. Some numbers have some of the same factors as other numbers. These are known as common factors. 3 is a factor of 9. 3 is a factor of 15. 3 is a common factor of 9 and 15.

The greatest common factor of the numbers 63 and 15 is 3.

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