Subtract 16/21 from 12/27
12/27 - 16/21 is -20/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 21 is 189
Next, find the equivalent fraction of both fractional numbers with denominator 189 - For the 1st fraction, since 27 × 7 = 189,
12/27 = 12 × 7/27 × 7 = 84/189 - Likewise, for the 2nd fraction, since 21 × 9 = 189,
16/21 = 16 × 9/21 × 9 = 144/189 - Subtract the two like fractions:
84/189 - 144/189 = 84 - 144/189 = -60/189 - After reducing the fraction, the answer is -20/63
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