Add 42/12 and 45/81
1st number: 3 6/12, 2nd number: 45/81
42/12 + 45/81 is 73/18.
Steps for adding 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,
42/12 = 42 × 27/12 × 27 = 1134/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
45/81 = 45 × 4/81 × 4 = 180/324 - Add the two like fractions:
1134/324 + 180/324 = 1134 + 180/324 = 1314/324 - 1314/324 simplified gives 73/18
- So, 42/12 + 45/81 = 73/18
In mixed form: 41/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12+45/81 42/12+90/81 42/24+45/81 42/36+45/81 42/60+45/81 42/84+45/81