Subtract 5/42 from 20/32, Solve 20/32

Subtract 5/42 from 20/32

20/32 - 5/42 is 85/168.

Find the least common denominator or LCM of the two denominators:
LCM of 32 and 42 is 672

Next, find the equivalent fraction of both fractional numbers with denominator 672
For the 1st fraction, since 32 × 21 = 672,
20/32 = 20 × 21/32 × 21 = 420/672
Likewise, for the 2nd fraction, since 42 × 16 = 672,
5/42 = 5 × 16/42 × 16 = 80/672
Subtract the two like fractions:
420/672 - 80/672 = 420 - 80/672 = 340/672
After reducing the fraction, the answer is 85/168

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