Subtract 42/54 from 10/40
10/40 - 42/54 is -19/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 54 is 1080
Next, find the equivalent fraction of both fractional numbers with denominator 1080 - For the 1st fraction, since 40 × 27 = 1080,
10/40 = 10 × 27/40 × 27 = 270/1080 - Likewise, for the 2nd fraction, since 54 × 20 = 1080,
42/54 = 42 × 20/54 × 20 = 840/1080 - Subtract the two like fractions:
270/1080 - 840/1080 = 270 - 840/1080 = -570/1080 - After reducing the fraction, the answer is -19/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40-42/54 10/40-84/54 10/80-42/54 30/40-42/54 50/40-42/54 70/40-42/54