Say the fraction was 1/5 then all you do is make it 7/1 divided by 1/5. Then you flip the second fraction and Multiply them so it would be 7/1 times by 5/1 which is 35
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You divide 7 into 4
divide eight into 5 and then divide 15 into 7 and compare the answers.
If you divide both sides of the fraction by 7, 7/35 becomes 1/5, or one fifth.
You divide 7 by 8, and multiply the result by 100.
Divide numerator by denominator eg 67/9 = 7&4/9