Add 28/21 and 10/18
1st number: 1 7/21, 2nd number: 10/18
28/21 + 10/18 is 17/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 21 × 6 = 126,
28/21 = 28 × 6/21 × 6 = 168/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
10/18 = 10 × 7/18 × 7 = 70/126 - Add the two like fractions:
168/126 + 70/126 = 168 + 70/126 = 238/126 - 238/126 simplified gives 17/9
- So, 28/21 + 10/18 = 17/9
In mixed form: 18/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21+10/18 28/21+20/18 28/42+10/18 28/21+10/36 84/21+10/18 28/21+30/18 28/63+10/18 28/21+10/54 28/21+50/18 28/21+10/90 28/21+70/18