Subtract 15/18 from 12/30
12/30 - 15/18 is -13/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 18 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 30 × 3 = 90,
12/30 = 12 × 3/30 × 3 = 36/90 - Likewise, for the 2nd fraction, since 18 × 5 = 90,
15/18 = 15 × 5/18 × 5 = 75/90 - Subtract the two like fractions:
36/90 - 75/90 = 36 - 75/90 = -39/90 - After reducing the fraction, the answer is -13/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/30-15/18 12/30-30/18 12/60-15/18 12/30-15/36 36/30-15/18 12/30-45/18 12/90-15/18 12/30-15/54 60/30-15/18 12/30-75/18 12/30-15/90 84/30-15/18