Add 7/21 and 45/18
1st number: 7/21, 2nd number: 2 9/18
7/21 + 45/18 is 17/6.
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,
45/18 = 45 × 7/18 × 7 = 315/126 - Add the two like fractions:
42/126 + 315/126 = 42 + 315/126 = 357/126 - 357/126 simplified gives 17/6
- So, 7/21 + 45/18 = 17/6
In mixed form: 25/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+45/18 7/21+90/18 7/42+45/18 7/21+45/36 7/63+45/18 7/21+45/54 35/21+45/18 7/21+45/90 49/21+45/18