Subtract 81/42 from 40/3
1st number: 13 1/3, 2nd number: 1 39/42
40/3 - 81/42 is 479/42.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 3 × 14 = 42,
40/3 = 40 × 14/3 × 14 = 560/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
81/42 = 81 × 1/42 × 1 = 81/42 - Subtract the two like fractions:
560/42 - 81/42 = 560 - 81/42 = 479/42 - In mixed form: 1117/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/3-81/42 40/6-81/42 40/3-81/84 40/9-81/42 40/15-81/42 40/21-81/42