Subtract 90/9 from 21/5
1st number: 4 1/5, 2nd number: 10 0/9
21/5 - 90/9 is -29/5.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 9 is 45
Next, find the equivalent fraction of both fractional numbers with denominator 45 - For the 1st fraction, since 5 × 9 = 45,
21/5 = 21 × 9/5 × 9 = 189/45 - Likewise, for the 2nd fraction, since 9 × 5 = 45,
90/9 = 90 × 5/9 × 5 = 450/45 - Subtract the two like fractions:
189/45 - 450/45 = 189 - 450/45 = -261/45 - After reducing the fraction, the answer is -29/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5-90/9 21/10-90/9 21/5-90/18 63/5-90/9 21/15-90/9 21/5-90/27 21/25-90/9 21/5-90/45 21/35-90/9 21/5-90/63