What is the greatest common factor of 30, 45, and 75?

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20-09-2016
Mathematics

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What is the greatest common factor of 30, 45, and 75?

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rinka2021219 rinka2021219 · Answer 1 · 2016-09-20T15:36:39+02:00

rinka2021219 rinka2021219

20-09-2016

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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