Subtract 70/84 from 6/21
6/21 - 70/84 is -23/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
6/21 = 6 × 4/21 × 4 = 24/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
70/84 = 70 × 1/84 × 1 = 70/84 - Subtract the two like fractions:
24/84 - 70/84 = 24 - 70/84 = -46/84 - After reducing the fraction, the answer is -23/42
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