Subtract 20/28 from 1/90
1/90 - 20/28 is -443/630.
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,
1/90 = 1 × 14/90 × 14 = 14/1260 - Likewise, for the 2nd fraction, since 28 × 45 = 1260,
20/28 = 20 × 45/28 × 45 = 900/1260 - Subtract the two like fractions:
14/1260 - 900/1260 = 14 - 900/1260 = -886/1260 - After reducing the fraction, the answer is -443/630
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/90-20/28 1/90-40/28 1/90-20/56 3/90-20/28 1/90-60/28 1/90-20/84 5/90-20/28 7/90-20/28