Subtract 15/12 from 21/4
1st number: 5 1/4, 2nd number: 1 3/12
21/4 - 15/12 is 4/1.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 12 is 12
Next, find the equivalent fraction of both fractional numbers with denominator 12 - For the 1st fraction, since 4 × 3 = 12,
21/4 = 21 × 3/4 × 3 = 63/12 - Likewise, for the 2nd fraction, since 12 × 1 = 12,
15/12 = 15 × 1/12 × 1 = 15/12 - Subtract the two like fractions:
63/12 - 15/12 = 63 - 15/12 = 48/12 - After reducing the fraction, the answer is 4/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/4-15/12 21/4-30/12 21/8-15/12 21/4-15/24 63/4-15/12 21/4-45/12 21/12-15/12 21/4-15/36 21/4-75/12 21/20-15/12 21/4-15/60 21/28-15/12 21/4-15/84