Subtract 18/9 from 20/7
1st number: 2 6/7, 2nd number: 2 0/9
20/7 - 18/9 is 6/7.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 7 × 9 = 63,
20/7 = 20 × 9/7 × 9 = 180/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
18/9 = 18 × 7/9 × 7 = 126/63 - Subtract the two like fractions:
180/63 - 126/63 = 180 - 126/63 = 54/63 - After reducing the fraction, the answer is 6/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/7-18/9 20/7-36/9 20/14-18/9 60/7-18/9 20/7-54/9 20/21-18/9 20/7-18/27 20/7-90/9 20/35-18/9 20/7-18/45 20/49-18/9 20/7-18/63