Subtract 15/40 from 42/49
42/49 - 15/40 is 27/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 49 and 40 is 1960
Next, find the equivalent fraction of both fractional numbers with denominator 1960 - For the 1st fraction, since 49 × 40 = 1960,
42/49 = 42 × 40/49 × 40 = 1680/1960 - Likewise, for the 2nd fraction, since 40 × 49 = 1960,
15/40 = 15 × 49/40 × 49 = 735/1960 - Subtract the two like fractions:
1680/1960 - 735/1960 = 1680 - 735/1960 = 945/1960 - After reducing the fraction, the answer is 27/56
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