Add 42/81 and 3/12
42/81 + 3/12 is 83/108.
Steps for adding 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,
42/81 = 42 × 4/81 × 4 = 168/324 - Likewise, for the 2nd fraction, since 12 × 27 = 324,
3/12 = 3 × 27/12 × 27 = 81/324 - Add the two like fractions:
168/324 + 81/324 = 168 + 81/324 = 249/324 - 249/324 simplified gives 83/108
- So, 42/81 + 3/12 = 83/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/81+3/12 42/81+6/12 42/81+3/24 42/81+9/12 42/81+3/36 42/81+15/12 42/81+3/60 42/81+21/12 42/81+3/84