Subtract 12/40 from 15/84
15/84 - 12/40 is -17/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 40 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 84 × 10 = 840,
15/84 = 15 × 10/84 × 10 = 150/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
12/40 = 12 × 21/40 × 21 = 252/840 - Subtract the two like fractions:
150/840 - 252/840 = 150 - 252/840 = -102/840 - After reducing the fraction, the answer is -17/140
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