Subtract 18/15 from 28/30
1st number: 28/30, 2nd number: 1 3/15
28/30 - 18/15 is -4/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 15 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 30 × 1 = 30,
28/30 = 28 × 1/30 × 1 = 28/30 - Likewise, for the 2nd fraction, since 15 × 2 = 30,
18/15 = 18 × 2/15 × 2 = 36/30 - Subtract the two like fractions:
28/30 - 36/30 = 28 - 36/30 = -8/30 - After reducing the fraction, the answer is -4/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/30-18/15 28/30-36/15 28/60-18/15 28/30-18/30 84/30-18/15 28/30-54/15 28/90-18/15 28/30-18/45 28/30-90/15 28/30-18/75