Subtract 40/20 from 15/84
1st number: 15/84, 2nd number: 2 0/20
15/84 - 40/20 is -51/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
15/84 = 15 × 5/84 × 5 = 75/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
40/20 = 40 × 21/20 × 21 = 840/420 - Subtract the two like fractions:
75/420 - 840/420 = 75 - 840/420 = -765/420 - After reducing the fraction, the answer is -51/28
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