Subtract 21/40 from 24/28
24/28 - 21/40 is 93/280.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 28 × 10 = 280,
24/28 = 24 × 10/28 × 10 = 240/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
21/40 = 21 × 7/40 × 7 = 147/280 - Subtract the two like fractions:
240/280 - 147/280 = 240 - 147/280 = 93/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 48/28-21/40 24/28-42/40 24/56-21/40 24/28-21/80 72/28-21/40 24/28-63/40 24/84-21/40