Subtract 12/21 from 10/15
10/15 - 12/21 is 2/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 21 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 15 × 7 = 105,
10/15 = 10 × 7/15 × 7 = 70/105 - Likewise, for the 2nd fraction, since 21 × 5 = 105,
12/21 = 12 × 5/21 × 5 = 60/105 - Subtract the two like fractions:
70/105 - 60/105 = 70 - 60/105 = 10/105 - After reducing the fraction, the answer is 2/21
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