Subtract 21/54 from 6/90
6/90 - 21/54 is -29/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 54 is 270
Next, find the equivalent fraction of both fractional numbers with denominator 270 - For the 1st fraction, since 90 × 3 = 270,
6/90 = 6 × 3/90 × 3 = 18/270 - Likewise, for the 2nd fraction, since 54 × 5 = 270,
21/54 = 21 × 5/54 × 5 = 105/270 - Subtract the two like fractions:
18/270 - 105/270 = 18 - 105/270 = -87/270 - After reducing the fraction, the answer is -29/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/90-21/54 6/90-42/54 18/90-21/54 6/90-63/54 30/90-21/54 42/90-21/54