Subtract 21/30 from 4/84
4/84 - 21/30 is -137/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 30 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
4/84 = 4 × 5/84 × 5 = 20/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
21/30 = 21 × 14/30 × 14 = 294/420 - Subtract the two like fractions:
20/420 - 294/420 = 20 - 294/420 = -274/420 - After reducing the fraction, the answer is -137/210
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