Subtract 42/45 from 21/63
21/63 - 42/45 is -3/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 45 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 45 × 7 = 315,
42/45 = 42 × 7/45 × 7 = 294/315 - Subtract the two like fractions:
105/315 - 294/315 = 105 - 294/315 = -189/315 - After reducing the fraction, the answer is -3/5
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