Subtract 20/84 from 42/54
42/54 - 20/84 is 34/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 54 and 84 is 756
Next, find the equivalent fraction of both fractional numbers with denominator 756 - For the 1st fraction, since 54 × 14 = 756,
42/54 = 42 × 14/54 × 14 = 588/756 - Likewise, for the 2nd fraction, since 84 × 9 = 756,
20/84 = 20 × 9/84 × 9 = 180/756 - Subtract the two like fractions:
588/756 - 180/756 = 588 - 180/756 = 408/756 - After reducing the fraction, the answer is 34/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/54-20/84 42/54-40/84 42/54-60/84