Subtract 20/25 from 7/21
7/21 - 20/25 is -7/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 25 is 525
Next, find the equivalent fraction of both fractional numbers with denominator 525 - For the 1st fraction, since 21 × 25 = 525,
7/21 = 7 × 25/21 × 25 = 175/525 - Likewise, for the 2nd fraction, since 25 × 21 = 525,
20/25 = 20 × 21/25 × 21 = 420/525 - Subtract the two like fractions:
175/525 - 420/525 = 175 - 420/525 = -245/525 - After reducing the fraction, the answer is -7/15
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