Add 42/12 and 40/81
1st number: 3 6/12, 2nd number: 40/81
42/12 + 40/81 is 647/162.
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,
40/81 = 40 × 4/81 × 4 = 160/324 - Add the two like fractions:
1134/324 + 160/324 = 1134 + 160/324 = 1294/324 - 1294/324 simplified gives 647/162
- So, 42/12 + 40/81 = 647/162
In mixed form: 3161/162
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12+40/81 42/12+80/81 42/24+40/81 42/36+40/81 42/60+40/81 42/84+40/81