Subtract 25/21 from 18/27
1st number: 18/27, 2nd number: 1 4/21
18/27 - 25/21 is -11/21.
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,
18/27 = 18 × 7/27 × 7 = 126/189 - Likewise, for the 2nd fraction, since 21 × 9 = 189,
25/21 = 25 × 9/21 × 9 = 225/189 - Subtract the two like fractions:
126/189 - 225/189 = 126 - 225/189 = -99/189 - After reducing the fraction, the answer is -11/21
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