Subtract 90/28 from 18/90
1st number: 18/90, 2nd number: 3 6/28
18/90 - 90/28 is -211/70.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 28 is 1260
Next, find the equivalent fraction of both fractional numbers with denominator 1260 - For the 1st fraction, since 90 × 14 = 1260,
18/90 = 18 × 14/90 × 14 = 252/1260 - Likewise, for the 2nd fraction, since 28 × 45 = 1260,
90/28 = 90 × 45/28 × 45 = 4050/1260 - Subtract the two like fractions:
252/1260 - 4050/1260 = 252 - 4050/1260 = -3798/1260 - After reducing the fraction, the answer is -211/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/90-90/28 18/90-90/56 54/90-90/28 18/90-90/84