Subtract 21/10 from 40/9
1st number: 4 4/9, 2nd number: 2 1/10
40/9 - 21/10 is 211/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 9 × 10 = 90,
40/9 = 40 × 10/9 × 10 = 400/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
21/10 = 21 × 9/10 × 9 = 189/90 - Subtract the two like fractions:
400/90 - 189/90 = 400 - 189/90 = 211/90 - In mixed form: 231/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/9-21/10 40/9-42/10 40/18-21/10 40/9-21/20 40/9-63/10 40/27-21/10 40/9-21/30 40/45-21/10 40/9-21/50 40/63-21/10 40/9-21/70