Add 20/21 and 40/18
1st number: 20/21, 2nd number: 2 4/18
20/21 + 40/18 is 200/63.
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,
20/21 = 20 × 6/21 × 6 = 120/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
40/18 = 40 × 7/18 × 7 = 280/126 - Add the two like fractions:
120/126 + 280/126 = 120 + 280/126 = 400/126 - 400/126 simplified gives 200/63
- So, 20/21 + 40/18 = 200/63
In mixed form: 311/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/21+40/18 20/21+80/18 20/42+40/18 20/21+40/36 60/21+40/18 20/63+40/18 20/21+40/54 20/21+40/90