Subtract 21/63 from 20/75
20/75 - 21/63 is -1/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 75 and 63 is 1575
Next, find the equivalent fraction of both fractional numbers with denominator 1575 - For the 1st fraction, since 75 × 21 = 1575,
20/75 = 20 × 21/75 × 21 = 420/1575 - Likewise, for the 2nd fraction, since 63 × 25 = 1575,
21/63 = 21 × 25/63 × 25 = 525/1575 - Subtract the two like fractions:
420/1575 - 525/1575 = 420 - 525/1575 = -105/1575 - After reducing the fraction, the answer is -1/15
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