Subtract 40/15 from 21/4
1st number: 5 1/4, 2nd number: 2 10/15
21/4 - 40/15 is 31/12.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 15 is 60
Next, find the equivalent fraction of both fractional numbers with denominator 60 - For the 1st fraction, since 4 × 15 = 60,
21/4 = 21 × 15/4 × 15 = 315/60 - Likewise, for the 2nd fraction, since 15 × 4 = 60,
40/15 = 40 × 4/15 × 4 = 160/60 - Subtract the two like fractions:
315/60 - 160/60 = 315 - 160/60 = 155/60 - After reducing the fraction, the answer is 31/12
- In mixed form: 27/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4-40/15 21/4-80/15 21/8-40/15 21/4-40/30 63/4-40/15 21/12-40/15 21/4-40/45 21/20-40/15 21/4-40/75 21/28-40/15