Add 20/18 and 63/21
1st number: 1 2/18, 2nd number: 3 0/21
20/18 + 63/21 is 37/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 21 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
20/18 = 20 × 7/18 × 7 = 140/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
63/21 = 63 × 6/21 × 6 = 378/126 - Add the two like fractions:
140/126 + 378/126 = 140 + 378/126 = 518/126 - 518/126 simplified gives 37/9
- So, 20/18 + 63/21 = 37/9
In mixed form: 41/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/18+63/21 20/36+63/21 20/18+63/42 60/18+63/21 20/54+63/21 20/90+63/21