Subtract 30/70 from 4/81
4/81 - 30/70 is -215/567.
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,
4/81 = 4 × 70/81 × 70 = 280/5670 - Likewise, for the 2nd fraction, since 70 × 81 = 5670,
30/70 = 30 × 81/70 × 81 = 2430/5670 - Subtract the two like fractions:
280/5670 - 2430/5670 = 280 - 2430/5670 = -2150/5670 - After reducing the fraction, the answer is -215/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/81-30/70 4/81-60/70 12/81-30/70 4/81-90/70 20/81-30/70 28/81-30/70