Add 5/21 and 40/18
1st number: 5/21, 2nd number: 2 4/18
5/21 + 40/18 is 155/63.
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,
40/18 = 40 × 7/18 × 7 = 280/126 - Add the two like fractions:
30/126 + 280/126 = 30 + 280/126 = 310/126 - 310/126 simplified gives 155/63
- So, 5/21 + 40/18 = 155/63
In mixed form: 229/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21+40/18 5/21+80/18 5/42+40/18 5/21+40/36 15/21+40/18 5/63+40/18 5/21+40/54 25/21+40/18 5/21+40/90 35/21+40/18