Subtract 80/9 from 7/21
1st number: 7/21, 2nd number: 8 8/9
7/21 - 80/9 is -77/9.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
7/21 = 7 × 3/21 × 3 = 21/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
80/9 = 80 × 7/9 × 7 = 560/63 - Subtract the two like fractions:
21/63 - 560/63 = 21 - 560/63 = -539/63 - After reducing the fraction, the answer is -77/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21-80/9 7/42-80/9 7/21-80/18 7/63-80/9 7/21-80/27 35/21-80/9 7/21-80/45 49/21-80/9 7/21-80/63