Subtract 48/7 from 20/21
1st number: 20/21, 2nd number: 6 6/7
20/21 - 48/7 is -124/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
20/21 = 20 × 1/21 × 1 = 20/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
48/7 = 48 × 3/7 × 3 = 144/21 - Subtract the two like fractions:
20/21 - 144/21 = 20 - 144/21 = -124/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21-48/7 20/21-96/7 20/42-48/7 20/21-48/14 60/21-48/7 20/63-48/7 20/21-48/21 20/21-48/35 20/21-48/49