Subtract 21/7 from 25/27, Solve 25/27

Subtract 21/7 from 25/27

1^st number: 25/27, 2^nd number: 3 0/7

25/27 - 21/7 is -56/27.

Find the least common denominator or LCM of the two denominators:
LCM of 27 and 7 is 189

Next, find the equivalent fraction of both fractional numbers with denominator 189
For the 1st fraction, since 27 × 7 = 189,
25/27 = 25 × 7/27 × 7 = 175/189
Likewise, for the 2nd fraction, since 7 × 27 = 189,
21/7 = 21 × 27/7 × 27 = 567/189
Subtract the two like fractions:
175/189 - 567/189 = 175 - 567/189 = -392/189
After reducing the fraction, the answer is -56/27

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