Subtract 27/54 from 42/45
42/45 - 27/54 is 13/30.
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,
42/45 = 42 × 6/45 × 6 = 252/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
27/54 = 27 × 5/54 × 5 = 135/270 - Subtract the two like fractions:
252/270 - 135/270 = 252 - 135/270 = 117/270 - 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: 84/45-27/54 42/90-27/54 42/45-81/54