Subtract 21/27 from 7/49
7/49 - 21/27 is -40/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 27 is 1323
Next, find the equivalent fraction of both fractional numbers with denominator 1323 - For the 1st fraction, since 49 × 27 = 1323,
7/49 = 7 × 27/49 × 27 = 189/1323 - Likewise, for the 2nd fraction, since 27 × 49 = 1323,
21/27 = 21 × 49/27 × 49 = 1029/1323 - Subtract the two like fractions:
189/1323 - 1029/1323 = 189 - 1029/1323 = -840/1323 - After reducing the fraction, the answer is -40/63
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