Subtract 18/54 from 12/45
12/45 - 18/54 is -1/15.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 45 × 6 = 270,
12/45 = 12 × 6/45 × 6 = 72/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
18/54 = 18 × 5/54 × 5 = 90/270 - Subtract the two like fractions:
72/270 - 90/270 = 72 - 90/270 = -18/270 - After reducing the fraction, the answer is -1/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/45-18/54 12/45-36/54 12/90-18/54 36/45-18/54 60/45-18/54 12/45-90/54 84/45-18/54