Subtract 21/30 from 40/15
1st number: 2 10/15, 2nd number: 21/30
40/15 - 21/30 is 59/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 30 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 15 × 2 = 30,
40/15 = 40 × 2/15 × 2 = 80/30 - Likewise, for the 2nd fraction, since 30 × 1 = 30,
21/30 = 21 × 1/30 × 1 = 21/30 - Subtract the two like fractions:
80/30 - 21/30 = 80 - 21/30 = 59/30 - In mixed form: 129/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/15-21/30 40/15-42/30 40/30-21/30 40/15-21/60 40/15-63/30 40/45-21/30 40/15-21/90 40/75-21/30