Subtract 28/25 from 21/30
1st number: 21/30, 2nd number: 1 3/25
21/30 - 28/25 is -21/50.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 25 is 150
Next, find the equivalent fraction of both fractional numbers with denominator 150 - For the 1st fraction, since 30 × 5 = 150,
21/30 = 21 × 5/30 × 5 = 105/150 - Likewise, for the 2nd fraction, since 25 × 6 = 150,
28/25 = 28 × 6/25 × 6 = 168/150 - Subtract the two like fractions:
105/150 - 168/150 = 105 - 168/150 = -63/150 - After reducing the fraction, the answer is -21/50
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30-28/25 21/30-56/25 21/60-28/25 21/30-28/50 63/30-28/25 21/30-84/25 21/90-28/25 21/30-28/75