Subtract 18/27 from 7/21
7/21 - 18/27 is -1/3.
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,
7/21 = 7 × 9/21 × 9 = 63/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
18/27 = 18 × 7/27 × 7 = 126/189 - Subtract the two like fractions:
63/189 - 126/189 = 63 - 126/189 = -63/189 - After reducing the fraction, the answer is -1/3
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