Subtract 81/70 from 21/6
1st number: 3 3/6, 2nd number: 1 11/70
21/6 - 81/70 is 82/35.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 6 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 6 × 35 = 210,
21/6 = 21 × 35/6 × 35 = 735/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
81/70 = 81 × 3/70 × 3 = 243/210 - Subtract the two like fractions:
735/210 - 243/210 = 735 - 243/210 = 492/210 - After reducing the fraction, the answer is 82/35
- In mixed form: 212/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/6-81/70 21/12-81/70 63/6-81/70 21/18-81/70 21/30-81/70 21/42-81/70