Subtract 42/54 from 8/45
8/45 - 42/54 is -3/5.
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,
8/45 = 8 × 6/45 × 6 = 48/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
42/54 = 42 × 5/54 × 5 = 210/270 - Subtract the two like fractions:
48/270 - 210/270 = 48 - 210/270 = -162/270 - After reducing the fraction, the answer is -3/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/45-42/54 8/45-84/54 8/90-42/54 24/45-42/54 40/45-42/54 56/45-42/54