Add 21/18 and 84/28
1st number: 1 3/18, 2nd number: 3 0/28
21/18 + 84/28 is 25/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 28 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 18 × 14 = 252,
21/18 = 21 × 14/18 × 14 = 294/252 - Likewise, for the 2nd fraction, since 28 × 9 = 252,
84/28 = 84 × 9/28 × 9 = 756/252 - Add the two like fractions:
294/252 + 756/252 = 294 + 756/252 = 1050/252 - 1050/252 simplified gives 25/6
- So, 21/18 + 84/28 = 25/6
In mixed form: 41/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+84/28 21/36+84/28 21/18+84/56 63/18+84/28 21/54+84/28 21/90+84/28