Subtract 42/54 from 10/20
10/20 - 42/54 is -5/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 54 is 540
Next, find the equivalent fraction of both fractional numbers with denominator 540 - For the 1st fraction, since 20 × 27 = 540,
10/20 = 10 × 27/20 × 27 = 270/540 - Likewise, for the 2nd fraction, since 54 × 10 = 540,
42/54 = 42 × 10/54 × 10 = 420/540 - Subtract the two like fractions:
270/540 - 420/540 = 270 - 420/540 = -150/540 - After reducing the fraction, the answer is -5/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20-84/54 10/40-42/54 30/20-42/54 10/60-42/54 50/20-42/54 70/20-42/54