Subtract 84/90 from 28/56
28/56 - 84/90 is -13/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 90 is 2520
Next, find the equivalent fraction of both fractional numbers with denominator 2520 - For the 1st fraction, since 56 × 45 = 2520,
28/56 = 28 × 45/56 × 45 = 1260/2520 - Likewise, for the 2nd fraction, since 90 × 28 = 2520,
84/90 = 84 × 28/90 × 28 = 2352/2520 - Subtract the two like fractions:
1260/2520 - 2352/2520 = 1260 - 2352/2520 = -1092/2520 - After reducing the fraction, the answer is -13/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/56-84/90