Subtract 4/42 from 15/40
15/40 - 4/42 is 47/168.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 42 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 40 × 21 = 840,
15/40 = 15 × 21/40 × 21 = 315/840 - Likewise, for the 2nd fraction, since 42 × 20 = 840,
4/42 = 4 × 20/42 × 20 = 80/840 - Subtract the two like fractions:
315/840 - 80/840 = 315 - 80/840 = 235/840 - After reducing the fraction, the answer is 47/168
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