Subtract 80/8 from 70/9
1st number: 7 7/9, 2nd number: 10 0/8
70/9 - 80/8 is -20/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 8 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 9 × 8 = 72,
70/9 = 70 × 8/9 × 8 = 560/72 - Likewise, for the 2nd fraction, since 8 × 9 = 72,
80/8 = 80 × 9/8 × 9 = 720/72 - Subtract the two like fractions:
560/72 - 720/72 = 560 - 720/72 = -160/72 - After reducing the fraction, the answer is -20/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/18-80/8 70/9-80/16 70/27-80/8 70/9-80/24 70/45-80/8 70/9-80/40 70/63-80/8 70/9-80/56