Subtract 18/30 from 21/24
21/24 - 18/30 is 11/40.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 30 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 24 × 5 = 120,
21/24 = 21 × 5/24 × 5 = 105/120 - Likewise, for the 2nd fraction, since 30 × 4 = 120,
18/30 = 18 × 4/30 × 4 = 72/120 - Subtract the two like fractions:
105/120 - 72/120 = 105 - 72/120 = 33/120 - After reducing the fraction, the answer is 11/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/24-18/30 21/24-36/30 21/48-18/30 21/24-18/60 63/24-18/30 21/24-54/30 21/72-18/30 21/24-18/90 21/24-90/30