Add 21/18 and 63/21
1st number: 1 3/18, 2nd number: 3 0/21
21/18 + 63/21 is 25/6.
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,
21/18 = 21 × 7/18 × 7 = 147/126 - Likewise, for the 2nd fraction, since 21 × 6 = 126,
63/21 = 63 × 6/21 × 6 = 378/126 - Add the two like fractions:
147/126 + 378/126 = 147 + 378/126 = 525/126 - 525/126 simplified gives 25/6
- So, 21/18 + 63/21 = 25/6
In mixed form: 41/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+63/21 21/36+63/21 21/18+63/42 63/18+63/21 21/54+63/21 21/90+63/21