Subtract 1/24 from 21/30
21/30 - 1/24 is 79/120.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 24 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 30 × 4 = 120,
21/30 = 21 × 4/30 × 4 = 84/120 - Likewise, for the 2nd fraction, since 24 × 5 = 120,
1/24 = 1 × 5/24 × 5 = 5/120 - Subtract the two like fractions:
84/120 - 5/120 = 84 - 5/120 = 79/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30-1/24 21/30-2/24 21/60-1/24 21/30-1/48 63/30-1/24 21/30-3/24 21/90-1/24 21/30-1/72 21/30-5/24 21/30-7/24