Subtract 15/21 from 5/4
1st number: 1 1/4, 2nd number: 15/21
5/4 - 15/21 is 15/28.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
5/4 = 5 × 21/4 × 21 = 105/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
15/21 = 15 × 4/21 × 4 = 60/84 - Subtract the two like fractions:
105/84 - 60/84 = 105 - 60/84 = 45/84 - After reducing the fraction, the answer is 15/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/4-15/21 5/4-30/21 5/8-15/21 5/4-15/42 15/4-15/21 5/4-45/21 5/12-15/21 5/4-15/63 25/4-15/21 5/4-75/21 5/20-15/21 35/4-15/21 5/28-15/21