Subtract 21/80 from 28/12
1st number: 2 4/12, 2nd number: 21/80
28/12 - 21/80 is 497/240.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 80 is 240
Next, find the equivalent fraction of both fractional numbers with denominator 240 - For the 1st fraction, since 12 × 20 = 240,
28/12 = 28 × 20/12 × 20 = 560/240 - Likewise, for the 2nd fraction, since 80 × 3 = 240,
21/80 = 21 × 3/80 × 3 = 63/240 - Subtract the two like fractions:
560/240 - 63/240 = 560 - 63/240 = 497/240 - In mixed form: 217/240
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/12-21/80 28/12-42/80 28/24-21/80 84/12-21/80 28/12-63/80 28/36-21/80 28/60-21/80 28/84-21/80