Subtract 20/7 from 90/80
1st number: 1 10/80, 2nd number: 2 6/7
90/80 - 20/7 is -97/56.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 80 and 7 is 560
Next, find the equivalent fraction of both fractional numbers with denominator 560 - For the 1st fraction, since 80 × 7 = 560,
90/80 = 90 × 7/80 × 7 = 630/560 - Likewise, for the 2nd fraction, since 7 × 80 = 560,
20/7 = 20 × 80/7 × 80 = 1600/560 - Subtract the two like fractions:
630/560 - 1600/560 = 630 - 1600/560 = -970/560 - After reducing the fraction, the answer is -97/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/80-40/7 90/80-20/14 90/80-60/7 90/80-20/21 90/80-20/35 90/80-20/49