Subtract 90/4 from 7/81
1st number: 7/81, 2nd number: 22 2/4
7/81 - 90/4 is -3631/162.
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,
7/81 = 7 × 4/81 × 4 = 28/324 - Likewise, for the 2nd fraction, since 4 × 81 = 324,
90/4 = 90 × 81/4 × 81 = 7290/324 - Subtract the two like fractions:
28/324 - 7290/324 = 28 - 7290/324 = -7262/324 - After reducing the fraction, the answer is -3631/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/81-90/4 7/81-90/8 21/81-90/4 7/81-90/12 35/81-90/4 7/81-90/20 49/81-90/4 7/81-90/28