Subtract 21/27 from 8/21
8/21 - 21/27 is -25/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 27 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 21 × 9 = 189,
8/21 = 8 × 9/21 × 9 = 72/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
21/27 = 21 × 7/27 × 7 = 147/189 - Subtract the two like fractions:
72/189 - 147/189 = 72 - 147/189 = -75/189 - After reducing the fraction, the answer is -25/63
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