Subtract 21/10 from 80/45
1st number: 1 35/45, 2nd number: 2 1/10
80/45 - 21/10 is -29/90.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 45 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 45 × 2 = 90,
80/45 = 80 × 2/45 × 2 = 160/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
21/10 = 21 × 9/10 × 9 = 189/90 - Subtract the two like fractions:
160/90 - 189/90 = 160 - 189/90 = -29/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/45-42/10 80/90-21/10 80/45-21/20 80/45-63/10 80/45-21/30 80/45-21/50 80/45-21/70