Subtract 21/80 from 7/70
7/70 - 21/80 is -13/80.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 80 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 70 × 8 = 560,
7/70 = 7 × 8/70 × 8 = 56/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
21/80 = 21 × 7/80 × 7 = 147/560 - Subtract the two like fractions:
56/560 - 147/560 = 56 - 147/560 = -91/560 - After reducing the fraction, the answer is -13/80
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