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Matheus Avellar · Answer 1 · 2017-04-21T01:38:11+0000

First, write out all the prime factorisation of 30, 45, and 70.
30: 2*3*5
45: 3*3*5
70: 2*5*7
Then, find a number that all three numbers have in common; which is 5. So, 5 is the greatest common factors of 30, 45, and 70.

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