Add 21/12 and 36/63
1st number: 1 9/12, 2nd number: 36/63
21/12 + 36/63 is 65/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 63 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 12 × 21 = 252,
21/12 = 21 × 21/12 × 21 = 441/252 - Likewise, for the 2nd fraction, since 63 × 4 = 252,
36/63 = 36 × 4/63 × 4 = 144/252 - Add the two like fractions:
441/252 + 144/252 = 441 + 144/252 = 585/252 - 585/252 simplified gives 65/28
- So, 21/12 + 36/63 = 65/28
In mixed form: 29/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+36/63 21/12+72/63 21/24+36/63 63/12+36/63 21/36+36/63 21/60+36/63 21/84+36/63