Subtract 3/70 from 7/81
7/81 - 3/70 is 247/5670.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 70 is 5670
Next, find the equivalent fraction of both fractional numbers with denominator 5670 - For the 1st fraction, since 81 × 70 = 5670,
7/81 = 7 × 70/81 × 70 = 490/5670 - Likewise, for the 2nd fraction, since 70 × 81 = 5670,
3/70 = 3 × 81/70 × 81 = 243/5670 - Subtract the two like fractions:
490/5670 - 243/5670 = 490 - 243/5670 = 247/5670
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/81-3/70 7/81-6/70 21/81-3/70 7/81-9/70 35/81-3/70 7/81-15/70 49/81-3/70 7/81-21/70