Subtract 20/21 from 5/45
5/45 - 20/21 is -53/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 21 is 315
Next, find the equivalent fraction of both fractional numbers with denominator 315 - For the 1st fraction, since 45 × 7 = 315,
5/45 = 5 × 7/45 × 7 = 35/315 - Likewise, for the 2nd fraction, since 21 × 15 = 315,
20/21 = 20 × 15/21 × 15 = 300/315 - Subtract the two like fractions:
35/315 - 300/315 = 35 - 300/315 = -265/315 - After reducing the fraction, the answer is -53/63
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