Subtract 21/45 from 28/5
1st number: 5 3/5, 2nd number: 21/45
28/5 - 21/45 is 77/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 45 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 5 × 9 = 45,
28/5 = 28 × 9/5 × 9 = 252/45 - Likewise, for the 2nd fraction, since 45 × 1 = 45,
21/45 = 21 × 1/45 × 1 = 21/45 - Subtract the two like fractions:
252/45 - 21/45 = 252 - 21/45 = 231/45 - After reducing the fraction, the answer is 77/15
- In mixed form: 52/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/5-21/45 28/5-42/45 28/10-21/45 28/5-21/90 84/5-21/45 28/5-63/45 28/15-21/45 28/25-21/45 28/35-21/45