Subtract 90/81 from 2/12
1st number: 2/12, 2nd number: 1 9/81
2/12 - 90/81 is -17/18.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 81 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 12 × 27 = 324,
2/12 = 2 × 27/12 × 27 = 54/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
90/81 = 90 × 4/81 × 4 = 360/324 - Subtract the two like fractions:
54/324 - 360/324 = 54 - 360/324 = -306/324 - After reducing the fraction, the answer is -17/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/12-90/81 2/24-90/81 6/12-90/81 2/36-90/81 10/12-90/81 2/60-90/81 14/12-90/81 2/84-90/81