Subtract 8/12 from 20/70
20/70 - 8/12 is -8/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 12 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 70 × 6 = 420,
20/70 = 20 × 6/70 × 6 = 120/420 - Likewise, for the 2nd fraction, since 12 × 35 = 420,
8/12 = 8 × 35/12 × 35 = 280/420 - Subtract the two like fractions:
120/420 - 280/420 = 120 - 280/420 = -160/420 - After reducing the fraction, the answer is -8/21
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