Add 63/21 and 18/36
1st number: 3 0/21, 2nd number: 18/36
63/21 + 18/36 is 7/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 36 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 21 × 12 = 252,
63/21 = 63 × 12/21 × 12 = 756/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
18/36 = 18 × 7/36 × 7 = 126/252 - Add the two like fractions:
756/252 + 126/252 = 756 + 126/252 = 882/252 - 882/252 simplified gives 7/2
- So, 63/21 + 18/36 = 7/2
In mixed form: 31/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/42+18/36 63/21+18/72 63/21+54/36 63/21+90/36