Subtract 1/20 from 28/90
28/90 - 1/20 is 47/180.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 20 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
28/90 = 28 × 2/90 × 2 = 56/180 - Likewise, for the 2nd fraction, since 20 × 9 = 180,
1/20 = 1 × 9/20 × 9 = 9/180 - Subtract the two like fractions:
56/180 - 9/180 = 56 - 9/180 = 47/180
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/90-1/20 28/90-2/20 28/90-1/40 84/90-1/20 28/90-3/20 28/90-1/60 28/90-5/20 28/90-7/20