Add 28/18 and 2/21
1st number: 1 10/18, 2nd number: 2/21
28/18 + 2/21 is 104/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
28/18 = 28 × 7/18 × 7 = 196/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
2/21 = 2 × 6/21 × 6 = 12/126 - Add the two like fractions:
196/126 + 12/126 = 196 + 12/126 = 208/126 - 208/126 simplified gives 104/63
- So, 28/18 + 2/21 = 104/63
In mixed form: 141/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/18+2/21 28/18+4/21 28/36+2/21 28/18+2/42 84/18+2/21 28/18+6/21 28/54+2/21 28/18+2/63 28/18+10/21 28/90+2/21 28/18+14/21