Subtract 18/27 from 18/21
18/21 - 18/27 is 4/21.
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,
18/21 = 18 × 9/21 × 9 = 162/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
18/27 = 18 × 7/27 × 7 = 126/189 - Subtract the two like fractions:
162/189 - 126/189 = 162 - 126/189 = 36/189 - After reducing the fraction, the answer is 4/21
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