Subtract 9/27 from 4/21
4/21 - 9/27 is -1/7.
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,
4/21 = 4 × 9/21 × 9 = 36/189 - Likewise, for the 2nd fraction, since 27 × 7 = 189,
9/27 = 9 × 7/27 × 7 = 63/189 - Subtract the two like fractions:
36/189 - 63/189 = 36 - 63/189 = -27/189 - After reducing the fraction, the answer is -1/7
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