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January 30, 2015

January 30, 2015

Posted by **Beth** on Sunday, December 19, 2010 at 11:04am.

should display your factor tree in your answer.

- maths -
**bobpursley**, Sunday, December 19, 2010 at 12:15pmI would start with the prime 5

5*315

5*5*63

5*5*3*21

5*5*3*3*7

check that.

- math -
**drwls**, Sunday, December 19, 2010 at 12:17pmI don't know what a factor tree is, but I'd start by dividing by 25, which is 5x5. Any number ending in 25 or 75 is divisible by that.

1575/(5x5) = 63 = 9x7 = 3x3x7

That leads to 3x3x5x5x7 = 1575

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