Subtract 18/56 from 21/30
21/30 - 18/56 is 53/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 56 is 840
Next, find the equivalent fraction of both fractional numbers with denominator 840 - For the 1st fraction, since 30 × 28 = 840,
21/30 = 21 × 28/30 × 28 = 588/840 - Likewise, for the 2nd fraction, since 56 × 15 = 840,
18/56 = 18 × 15/56 × 15 = 270/840 - Subtract the two like fractions:
588/840 - 270/840 = 588 - 270/840 = 318/840 - After reducing the fraction, the answer is 53/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30-18/56 21/30-36/56 21/60-18/56 63/30-18/56 21/30-54/56 21/90-18/56 21/30-90/56