Subtract 10/64 from 20/42, Solve 20/42

Subtract 10/64 from 20/42

20/42 - 10/64 is 215/672.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 64 is 1344

Next, find the equivalent fraction of both fractional numbers with denominator 1344
For the 1st fraction, since 42 × 32 = 1344,
20/42 = 20 × 32/42 × 32 = 640/1344
Likewise, for the 2nd fraction, since 64 × 21 = 1344,
10/64 = 10 × 21/64 × 21 = 210/1344
Subtract the two like fractions:
640/1344 - 210/1344 = 640 - 210/1344 = 430/1344
After reducing the fraction, the answer is 215/672

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