Subtract 21/10 from 40/90
1st number: 40/90, 2nd number: 2 1/10
40/90 - 21/10 is -149/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
40/90 = 40 × 1/90 × 1 = 40/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
21/10 = 21 × 9/10 × 9 = 189/90 - Subtract the two like fractions:
40/90 - 189/90 = 40 - 189/90 = -149/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/90-21/10 40/90-42/10 40/90-21/20 40/90-63/10 40/90-21/30 40/90-21/50 40/90-21/70