Subtract 70/21 from 9/10
1st number: 9/10, 2nd number: 3 7/21
9/10 - 70/21 is -73/30.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
9/10 = 9 × 21/10 × 21 = 189/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
70/21 = 70 × 10/21 × 10 = 700/210 - Subtract the two like fractions:
189/210 - 700/210 = 189 - 700/210 = -511/210 - After reducing the fraction, the answer is -73/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/10-70/21 9/20-70/21 9/10-70/42 27/10-70/21 9/30-70/21 9/10-70/63 45/10-70/21 9/50-70/21 63/10-70/21 9/70-70/21