Subtract 21/35 from 40/84
40/84 - 21/35 is -13/105.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 35 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
40/84 = 40 × 5/84 × 5 = 200/420 - Likewise, for the 2nd fraction, since 35 × 12 = 420,
21/35 = 21 × 12/35 × 12 = 252/420 - Subtract the two like fractions:
200/420 - 252/420 = 200 - 252/420 = -52/420 - After reducing the fraction, the answer is -13/105
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