Add 25/18 and 28/21
1st number: 1 7/18, 2nd number: 1 7/21
25/18 + 28/21 is 49/18.
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,
25/18 = 25 × 7/18 × 7 = 175/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
28/21 = 28 × 6/21 × 6 = 168/126 - Add the two like fractions:
175/126 + 168/126 = 175 + 168/126 = 343/126 - 343/126 simplified gives 49/18
- So, 25/18 + 28/21 = 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: 50/18+28/21 25/18+56/21 25/36+28/21 25/18+28/42 75/18+28/21 25/18+84/21 25/54+28/21 25/18+28/63 25/90+28/21