Subtract 50/81 from 9/70
9/70 - 50/81 is -2771/5670.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 81 is 5670
Next, find the equivalent fraction of both fractional numbers with denominator 5670 - For the 1st fraction, since 70 × 81 = 5670,
9/70 = 9 × 81/70 × 81 = 729/5670 - Likewise, for the 2nd fraction, since 81 × 70 = 5670,
50/81 = 50 × 70/81 × 70 = 3500/5670 - Subtract the two like fractions:
729/5670 - 3500/5670 = 729 - 3500/5670 = -2771/5670
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/70-50/81 27/70-50/81 45/70-50/81 63/70-50/81