Subtract 20/21 from 2/27
2/27 - 20/21 is -166/189.
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,
2/27 = 2 × 7/27 × 7 = 14/189 - Likewise, for the 2nd fraction, since 21 × 9 = 189,
20/21 = 20 × 9/21 × 9 = 180/189 - Subtract the two like fractions:
14/189 - 180/189 = 14 - 180/189 = -166/189
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