Add 3/12 and 81/42
1st number: 3/12, 2nd number: 1 39/42
3/12 + 81/42 is 61/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
3/12 = 3 × 7/12 × 7 = 21/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
81/42 = 81 × 2/42 × 2 = 162/84 - Add the two like fractions:
21/84 + 162/84 = 21 + 162/84 = 183/84 - 183/84 simplified gives 61/28
- So, 3/12 + 81/42 = 61/28
In mixed form: 25/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/12+81/42 3/24+81/42 3/12+81/84 9/12+81/42 3/36+81/42 15/12+81/42 3/60+81/42 21/12+81/42 3/84+81/42