Subtract 90/7 from 9/80
1st number: 9/80, 2nd number: 12 6/7
9/80 - 90/7 is -7137/560.
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,
9/80 = 9 × 7/80 × 7 = 63/560 - Likewise, for the 2nd fraction, since 7 × 80 = 560,
90/7 = 90 × 80/7 × 80 = 7200/560 - Subtract the two like fractions:
63/560 - 7200/560 = 63 - 7200/560 = -7137/560
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/80-90/7 9/80-90/14 27/80-90/7 9/80-90/21 45/80-90/7 9/80-90/35 63/80-90/7 9/80-90/49