Subtract 7/15 from 21/63
21/63 - 7/15 is -2/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 15 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 63 × 5 = 315,
21/63 = 21 × 5/63 × 5 = 105/315 - Likewise, for the 2nd fraction, since 15 × 21 = 315,
7/15 = 7 × 21/15 × 21 = 147/315 - Subtract the two like fractions:
105/315 - 147/315 = 105 - 147/315 = -42/315 - After reducing the fraction, the answer is -2/15
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