Posted by Beth on Sunday, December 19, 2010 at 11:04am.
Use a factor tree to write 1575 as a product of prime factors. You
should display your factor tree in your answer.

maths  bobpursley, Sunday, December 19, 2010 at 12:15pm
I 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 12:17pm
I 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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