Subtract 30/45 from 70/81
70/81 - 30/45 is 16/81.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 45 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 81 × 5 = 405,
70/81 = 70 × 5/81 × 5 = 350/405 - Likewise, for the 2nd fraction, since 45 × 9 = 405,
30/45 = 30 × 9/45 × 9 = 270/405 - Subtract the two like fractions:
350/405 - 270/405 = 350 - 270/405 = 80/405 - After reducing the fraction, the answer is 16/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 70/81-60/45 70/81-30/90 70/81-90/45