Add 7/21 and 25/18
1st number: 7/21, 2nd number: 1 7/18
7/21 + 25/18 is 31/18.
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,
7/21 = 7 × 6/21 × 6 = 42/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
25/18 = 25 × 7/18 × 7 = 175/126 - Add the two like fractions:
42/126 + 175/126 = 42 + 175/126 = 217/126 - 217/126 simplified gives 31/18
- So, 7/21 + 25/18 = 31/18
In mixed form: 113/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+25/18 7/21+50/18 7/42+25/18 7/21+25/36 7/21+75/18 7/63+25/18 7/21+25/54 35/21+25/18 7/21+25/90 49/21+25/18