Subtract 1/21 from 20/3
1st number: 6 2/3, 2nd number: 1/21
20/3 - 1/21 is 139/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 21 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 3 × 7 = 21,
20/3 = 20 × 7/3 × 7 = 140/21 - Likewise, for the 2nd fraction, since 21 × 1 = 21,
1/21 = 1 × 1/21 × 1 = 1/21 - Subtract the two like fractions:
140/21 - 1/21 = 140 - 1/21 = 139/21 - In mixed form: 613/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/3-1/21 20/3-2/21 20/6-1/21 20/3-1/42 60/3-1/21 20/3-3/21 20/9-1/21 20/3-1/63 20/3-5/21 20/15-1/21 20/3-7/21 20/21-1/21