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A factor tree of 1575: 1575 / \ 5 325 / \ 5 65 / \ 5 13 Answer: 5*5*5*13 or 13*53
You have just written it "in numbers."
You need two or more numbers to find common factors.ex. "What are the common factors of 1575 and 1780?"
315 over 1575 in lowest terms = 1/5
about... 25 just take 5 numbers times 5 numbers