Subtract 24/54 from 20/42
20/42 - 24/54 is 2/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 54 is 378
Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 42 × 9 = 378,
20/42 = 20 × 9/42 × 9 = 180/378 - Likewise, for the 2nd fraction, since 54 × 7 = 378,
24/54 = 24 × 7/54 × 7 = 168/378 - Subtract the two like fractions:
180/378 - 168/378 = 180 - 168/378 = 12/378 - After reducing the fraction, the answer is 2/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42-24/54 20/42-48/54 20/84-24/54 60/42-24/54 20/42-72/54