Subtract 1/10 from 80/21
1st number: 3 17/21, 2nd number: 1/10
80/21 - 1/10 is 779/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 10 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
80/21 = 80 × 10/21 × 10 = 800/210 - Likewise, for the 2nd fraction, since 10 × 21 = 210,
1/10 = 1 × 21/10 × 21 = 21/210 - Subtract the two like fractions:
800/210 - 21/210 = 800 - 21/210 = 779/210 - In mixed form: 3149/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21-2/10 80/42-1/10 80/21-1/20 80/21-3/10 80/63-1/10 80/21-1/30 80/21-5/10 80/21-1/50 80/21-7/10 80/21-1/70