Subtract 15/25 from 10/21
10/21 - 15/25 is -13/105.
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,
10/21 = 10 × 25/21 × 25 = 250/525 - Likewise, for the 2nd fraction, since 25 × 21 = 525,
15/25 = 15 × 21/25 × 21 = 315/525 - Subtract the two like fractions:
250/525 - 315/525 = 250 - 315/525 = -65/525 - After reducing the fraction, the answer is -13/105
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