Subtract 15/28 from 80/21
1st number: 3 17/21, 2nd number: 15/28
80/21 - 15/28 is 275/84.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 28 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
80/21 = 80 × 4/21 × 4 = 320/84 - Likewise, for the 2nd fraction, since 28 × 3 = 84,
15/28 = 15 × 3/28 × 3 = 45/84 - Subtract the two like fractions:
320/84 - 45/84 = 320 - 45/84 = 275/84 - In mixed form: 323/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21-30/28 80/42-15/28 80/21-15/56 80/21-45/28 80/63-15/28 80/21-15/84 80/21-75/28