Subtract 81/70 from 1/3
1st number: 1/3, 2nd number: 1 11/70
1/3 - 81/70 is -173/210.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 3 × 70 = 210,
1/3 = 1 × 70/3 × 70 = 70/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
81/70 = 81 × 3/70 × 3 = 243/210 - Subtract the two like fractions:
70/210 - 243/210 = 70 - 243/210 = -173/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/3-81/70 1/6-81/70 1/9-81/70 5/3-81/70 1/15-81/70 7/3-81/70 1/21-81/70