Add 5/21 and 45/18
1st number: 5/21, 2nd number: 2 9/18
5/21 + 45/18 is 115/42.
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,
5/21 = 5 × 6/21 × 6 = 30/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
45/18 = 45 × 7/18 × 7 = 315/126 - Add the two like fractions:
30/126 + 315/126 = 30 + 315/126 = 345/126 - 345/126 simplified gives 115/42
- So, 5/21 + 45/18 = 115/42
In mixed form: 231/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21+45/18 5/21+90/18 5/42+45/18 5/21+45/36 15/21+45/18 5/63+45/18 5/21+45/54 25/21+45/18 5/21+45/90 35/21+45/18