Add 21/18 and 84/54
1st number: 1 3/18, 2nd number: 1 30/54
21/18 + 84/54 is 49/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 54 is 54
Next, find the equivalent fraction of both fractional numbers with denominator 54 - For the 1st fraction, since 18 × 3 = 54,
21/18 = 21 × 3/18 × 3 = 63/54 - Likewise, for the 2nd fraction, since 54 × 1 = 54,
84/54 = 84 × 1/54 × 1 = 84/54 - Add the two like fractions:
63/54 + 84/54 = 63 + 84/54 = 147/54 - 147/54 simplified gives 49/18
- So, 21/18 + 84/54 = 49/18
In mixed form: 213/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+84/54 21/36+84/54 63/18+84/54 21/54+84/54 21/90+84/54