Subtract 80/70 from 2/21
1st number: 2/21, 2nd number: 1 10/70
2/21 - 80/70 is -22/21.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 70 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
2/21 = 2 × 10/21 × 10 = 20/210 - Likewise, for the 2nd fraction, since 70 × 3 = 210,
80/70 = 80 × 3/70 × 3 = 240/210 - Subtract the two like fractions:
20/210 - 240/210 = 20 - 240/210 = -220/210 - After reducing the fraction, the answer is -22/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/21-80/70 2/42-80/70 6/21-80/70 2/63-80/70 10/21-80/70 14/21-80/70