Subtract 21/90 from 8/9
8/9 - 21/90 is 59/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 9 × 10 = 90,
8/9 = 8 × 10/9 × 10 = 80/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
21/90 = 21 × 1/90 × 1 = 21/90 - Subtract the two like fractions:
80/90 - 21/90 = 80 - 21/90 = 59/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/9-21/90 8/9-42/90 8/18-21/90 24/9-21/90 8/9-63/90 8/27-21/90 40/9-21/90 8/45-21/90 56/9-21/90 8/63-21/90