Subtract 18/40 from 3/84
3/84 - 18/40 is -29/70.
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,
3/84 = 3 × 10/84 × 10 = 30/840 - Likewise, for the 2nd fraction, since 40 × 21 = 840,
18/40 = 18 × 21/40 × 21 = 378/840 - Subtract the two like fractions:
30/840 - 378/840 = 30 - 378/840 = -348/840 - After reducing the fraction, the answer is -29/70
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