Subtract 8/7 from 80/90
1st number: 80/90, 2nd number: 1 1/7
80/90 - 8/7 is -16/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 7 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
80/90 = 80 × 7/90 × 7 = 560/630 - Likewise, for the 2nd fraction, since 7 × 90 = 630,
8/7 = 8 × 90/7 × 90 = 720/630 - Subtract the two like fractions:
560/630 - 720/630 = 560 - 720/630 = -160/630 - After reducing the fraction, the answer is -16/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/90-16/7 80/90-8/14 80/90-24/7 80/90-8/21 80/90-40/7 80/90-8/35 80/90-56/7 80/90-8/49