Subtract 7/4 from 45/81
1st number: 45/81, 2nd number: 1 3/4
45/81 - 7/4 is -43/36.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 4 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 81 × 4 = 324,
45/81 = 45 × 4/81 × 4 = 180/324 - Likewise, for the 2nd fraction, since 4 × 81 = 324,
7/4 = 7 × 81/4 × 81 = 567/324 - Subtract the two like fractions:
180/324 - 567/324 = 180 - 567/324 = -387/324 - After reducing the fraction, the answer is -43/36
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/81-7/4 45/81-14/4 45/81-7/8 45/81-21/4 45/81-7/12 45/81-35/4 45/81-7/20 45/81-49/4 45/81-7/28