Add 28/84 and 18/8
1st number: 28/84, 2nd number: 2 2/8
28/84 + 18/8 is 31/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 84 × 2 = 168,
28/84 = 28 × 2/84 × 2 = 56/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
18/8 = 18 × 21/8 × 21 = 378/168 - Add the two like fractions:
56/168 + 378/168 = 56 + 378/168 = 434/168 - 434/168 simplified gives 31/12
- So, 28/84 + 18/8 = 31/12
In mixed form: 27/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/84+18/8 28/84+36/8 28/84+18/16 28/84+54/8 28/84+18/24 28/84+90/8 28/84+18/40 28/84+18/56