Subtract 63/80 from 42/70
42/70 - 63/80 is -3/16.
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,
42/70 = 42 × 8/70 × 8 = 336/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
63/80 = 63 × 7/80 × 7 = 441/560 - Subtract the two like fractions:
336/560 - 441/560 = 336 - 441/560 = -105/560 - After reducing the fraction, the answer is -3/16
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