Subtract 5/7 from 45/81
45/81 - 5/7 is -10/63.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 7 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 81 × 7 = 567,
45/81 = 45 × 7/81 × 7 = 315/567 - Likewise, for the 2nd fraction, since 7 × 81 = 567,
5/7 = 5 × 81/7 × 81 = 405/567 - Subtract the two like fractions:
315/567 - 405/567 = 315 - 405/567 = -90/567 - After reducing the fraction, the answer is -10/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/81-5/7 45/81-10/7 45/81-5/14 45/81-15/7 45/81-5/21 45/81-25/7 45/81-5/35 45/81-35/7 45/81-5/49