Subtract 7/90 from 20/27
20/27 - 7/90 is 179/270.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 27 and 90 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 27 × 10 = 270,
20/27 = 20 × 10/27 × 10 = 200/270 - Likewise, for the 2nd fraction, since 90 × 3 = 270,
7/90 = 7 × 3/90 × 3 = 21/270 - Subtract the two like fractions:
200/270 - 21/270 = 200 - 21/270 = 179/270
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/27-7/90 20/27-14/90 20/54-7/90 60/27-7/90 20/27-21/90 20/81-7/90 20/27-35/90 20/27-49/90