Subtract 18/30 from 15/28
15/28 - 18/30 is -9/140.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 30 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 28 × 15 = 420,
15/28 = 15 × 15/28 × 15 = 225/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
18/30 = 18 × 14/30 × 14 = 252/420 - Subtract the two like fractions:
225/420 - 252/420 = 225 - 252/420 = -27/420 - After reducing the fraction, the answer is -9/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/28-18/30 15/28-36/30 15/56-18/30 15/28-18/60 45/28-18/30 15/28-54/30 15/84-18/30 15/28-18/90 75/28-18/30 15/28-90/30