Subtract 21/12 from 40/3
1st number: 13 1/3, 2nd number: 1 9/12
40/3 - 21/12 is 139/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 12 is 12
Next, find the equivalent fraction of both fractional numbers with denominator 12 - For the 1st fraction, since 3 × 4 = 12,
40/3 = 40 × 4/3 × 4 = 160/12 - Likewise, for the 2nd fraction, since 12 × 1 = 12,
21/12 = 21 × 1/12 × 1 = 21/12 - Subtract the two like fractions:
160/12 - 21/12 = 160 - 21/12 = 139/12 - In mixed form: 117/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/3-21/12 40/3-42/12 40/6-21/12 40/3-21/24 40/3-63/12 40/9-21/12 40/3-21/36 40/15-21/12 40/3-21/60 40/21-21/12 40/3-21/84