Add 12/84 and 21/7
1st number: 12/84, 2nd number: 3 0/7
12/84 + 21/7 is 22/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
12/84 = 12 × 1/84 × 1 = 12/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
21/7 = 21 × 12/7 × 12 = 252/84 - Add the two like fractions:
12/84 + 252/84 = 12 + 252/84 = 264/84 - 264/84 simplified gives 22/7
- So, 12/84 + 21/7 = 22/7
In mixed form: 31/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/84+21/7 12/84+42/7 12/84+21/14 36/84+21/7 12/84+63/7 60/84+21/7 12/84+21/35 12/84+21/49