Subtract 42/80 from 10/70
10/70 - 42/80 is -107/280.
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,
10/70 = 10 × 8/70 × 8 = 80/560 - Likewise, for the 2nd fraction, since 80 × 7 = 560,
42/80 = 42 × 7/80 × 7 = 294/560 - Subtract the two like fractions:
80/560 - 294/560 = 80 - 294/560 = -214/560 - After reducing the fraction, the answer is -107/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/70-42/80 10/70-84/80 30/70-42/80 50/70-42/80