Subtract 42/70 from 12/80
12/80 - 42/70 is -9/20.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 70 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 80 × 7 = 560,
12/80 = 12 × 7/80 × 7 = 84/560 - Likewise, for the 2nd fraction, since 70 × 8 = 560,
42/70 = 42 × 8/70 × 8 = 336/560 - Subtract the two like fractions:
84/560 - 336/560 = 84 - 336/560 = -252/560 - After reducing the fraction, the answer is -9/20
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