Subtract 21/63 from 21/49
21/49 - 21/63 is 2/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 63 is 441
Next, find the equivalent fraction of both fractional numbers with denominator 441 - For the 1st fraction, since 49 × 9 = 441,
21/49 = 21 × 9/49 × 9 = 189/441 - Likewise, for the 2nd fraction, since 63 × 7 = 441,
21/63 = 21 × 7/63 × 7 = 147/441 - Subtract the two like fractions:
189/441 - 147/441 = 189 - 147/441 = 42/441 - After reducing the fraction, the answer is 2/21
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