Subtract 7/20 from 7/9
7/9 - 7/20 is 77/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 9 × 20 = 180,
7/9 = 7 × 20/9 × 20 = 140/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
7/20 = 7 × 9/20 × 9 = 63/180 - Subtract the two like fractions:
140/180 - 63/180 = 140 - 63/180 = 77/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/9-7/20 7/9-14/20 7/18-7/20 7/9-7/40 21/9-7/20 7/9-21/20 7/27-7/20 7/9-7/60 35/9-7/20 7/9-35/20 7/45-7/20 49/9-7/20 7/9-49/20 7/63-7/20