Subtract 30/12 from 7/81
1st number: 7/81, 2nd number: 2 6/12
7/81 - 30/12 is -391/162.
Steps for subtracting fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 12 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 12 × 27 = 324,
30/12 = 30 × 27/12 × 27 = 810/324 - Subtract the two like fractions:
28/324 - 810/324 = 28 - 810/324 = -782/324 - After reducing the fraction, the answer is -391/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/81-30/12 7/81-60/12 7/81-30/24 21/81-30/12 7/81-90/12 7/81-30/36 35/81-30/12 7/81-30/60 49/81-30/12 7/81-30/84