Subtract 21/27 from 27/90
27/90 - 21/27 is -43/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 27 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 90 × 3 = 270,
27/90 = 27 × 3/90 × 3 = 81/270 - Likewise, for the 2nd fraction, since 27 × 10 = 270,
21/27 = 21 × 10/27 × 10 = 210/270 - Subtract the two like fractions:
81/270 - 210/270 = 81 - 210/270 = -129/270 - After reducing the fraction, the answer is -43/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/90-21/27 27/90-42/27 27/90-21/54 81/90-21/27 27/90-63/27 27/90-21/81