Add 63/21 and 12/9
1st number: 3 0/21, 2nd number: 1 3/9
63/21 + 12/9 is 13/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
63/21 = 63 × 3/21 × 3 = 189/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
12/9 = 12 × 7/9 × 7 = 84/63 - Add the two like fractions:
189/63 + 84/63 = 189 + 84/63 = 273/63 - 273/63 simplified gives 13/3
- So, 63/21 + 12/9 = 13/3
In mixed form: 41/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 63/21+24/9 63/42+12/9 63/21+12/18 63/21+36/9 63/21+12/27 63/21+60/9 63/21+12/45 63/21+84/9 63/21+12/63