Subtract 20/64 from 7/27, Solve 7/27

Subtract 20/64 from 7/27

7/27 - 20/64 is -23/432.

Find the least common denominator or LCM of the two denominators:
LCM of 27 and 64 is 1728

Next, find the equivalent fraction of both fractional numbers with denominator 1728
For the 1st fraction, since 27 × 64 = 1728,
7/27 = 7 × 64/27 × 64 = 448/1728
Likewise, for the 2nd fraction, since 64 × 27 = 1728,
20/64 = 20 × 27/64 × 27 = 540/1728
Subtract the two like fractions:
448/1728 - 540/1728 = 448 - 540/1728 = -92/1728
After reducing the fraction, the answer is -23/432

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