Subtract 15/28 from 8/30
8/30 - 15/28 is -113/420.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 28 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 30 × 14 = 420,
8/30 = 8 × 14/30 × 14 = 112/420 - Likewise, for the 2nd fraction, since 28 × 15 = 420,
15/28 = 15 × 15/28 × 15 = 225/420 - Subtract the two like fractions:
112/420 - 225/420 = 112 - 225/420 = -113/420
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/30-15/28 8/30-30/28 8/60-15/28 8/30-15/56 24/30-15/28 8/30-45/28 8/90-15/28 8/30-15/84 40/30-15/28 8/30-75/28 56/30-15/28