Add 9/21 and 12/8
1st number: 9/21, 2nd number: 1 4/8
9/21 + 12/8 is 27/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 8 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
9/21 = 9 × 8/21 × 8 = 72/168 - Likewise, for the 2nd fraction, since 8 × 21 = 168,
12/8 = 12 × 21/8 × 21 = 252/168 - Add the two like fractions:
72/168 + 252/168 = 72 + 252/168 = 324/168 - 324/168 simplified gives 27/14
- So, 9/21 + 12/8 = 27/14
In mixed form: 113/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/21+12/8 9/21+24/8 9/42+12/8 9/21+12/16 27/21+12/8 9/21+36/8 9/63+12/8 9/21+12/24 45/21+12/8 9/21+60/8 9/21+12/40 63/21+12/8 9/21+84/8 9/21+12/56