Subtract 90/84 from 20/54
1st number: 20/54, 2nd number: 1 6/84
20/54 - 90/84 is -265/378.
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,
20/54 = 20 × 14/54 × 14 = 280/756 - Likewise, for the 2nd fraction, since 84 × 9 = 756,
90/84 = 90 × 9/84 × 9 = 810/756 - Subtract the two like fractions:
280/756 - 810/756 = 280 - 810/756 = -530/756 - After reducing the fraction, the answer is -265/378
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/54-90/84 60/54-90/84