Subtract 15/30 from 12/27
12/27 - 15/30 is -1/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 30 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 27 × 10 = 270,
12/27 = 12 × 10/27 × 10 = 120/270 - Likewise, for the 2nd fraction, since 30 × 9 = 270,
15/30 = 15 × 9/30 × 9 = 135/270 - Subtract the two like fractions:
120/270 - 135/270 = 120 - 135/270 = -15/270 - After reducing the fraction, the answer is -1/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/27-15/30 12/54-15/30 12/27-15/60 36/27-15/30 12/27-45/30 12/81-15/30 12/27-15/90 60/27-15/30 12/27-75/30 84/27-15/30