Subtract 30/81 from 3/70
3/70 - 30/81 is -619/1890.
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,
3/70 = 3 × 81/70 × 81 = 243/5670 - Likewise, for the 2nd fraction, since 81 × 70 = 5670,
30/81 = 30 × 70/81 × 70 = 2100/5670 - Subtract the two like fractions:
243/5670 - 2100/5670 = 243 - 2100/5670 = -1857/5670 - After reducing the fraction, the answer is -619/1890
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/70-30/81 3/70-60/81 9/70-30/81 3/70-90/81 15/70-30/81 21/70-30/81