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No. If there are larger common factors, use them instead. It will be much quicker. The most efficient is to use the highest common factor (HCF).

For example, to simplify 70/100

you could use the prime factors 2 and 5 to do

70/100 = 35/50 = 7/10

or

you could simply go for 10, as a common factor so that 70/100 = 7/10.

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