Subtract 42/12 from 1/81
1st number: 1/81, 2nd number: 3 6/12
1/81 - 42/12 is -565/162.
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,
1/81 = 1 × 4/81 × 4 = 4/324 - Likewise, for the 2nd fraction, since 12 × 27 = 324,
42/12 = 42 × 27/12 × 27 = 1134/324 - Subtract the two like fractions:
4/324 - 1134/324 = 4 - 1134/324 = -1130/324 - After reducing the fraction, the answer is -565/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/81-42/12 1/81-84/12 1/81-42/24 3/81-42/12 1/81-42/36 5/81-42/12 1/81-42/60 7/81-42/12 1/81-42/84