Subtract 21/30 from 2/9
2/9 - 21/30 is -43/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 30 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 9 × 10 = 90,
2/9 = 2 × 10/9 × 10 = 20/90 - Likewise, for the 2nd fraction, since 30 × 3 = 90,
21/30 = 21 × 3/30 × 3 = 63/90 - Subtract the two like fractions:
20/90 - 63/90 = 20 - 63/90 = -43/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/9-21/30 2/9-42/30 2/18-21/30 2/9-21/60 6/9-21/30 2/9-63/30 2/27-21/30 2/9-21/90 10/9-21/30 2/45-21/30 14/9-21/30 2/63-21/30