Subtract 20/90 from 28/18
1st number: 1 10/18, 2nd number: 20/90
28/18 - 20/90 is 4/3.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 18 × 5 = 90,
28/18 = 28 × 5/18 × 5 = 140/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
20/90 = 20 × 1/90 × 1 = 20/90 - Subtract the two like fractions:
140/90 - 20/90 = 140 - 20/90 = 120/90 - After reducing the fraction, the answer is 4/3
- In mixed form: 11/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/18-20/90 28/18-40/90 28/36-20/90 84/18-20/90 28/18-60/90 28/54-20/90 28/90-20/90