Add 84/12 and 21/7
1st number: 7 0/12, 2nd number: 3 0/7
84/12 + 21/7 is 10/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 7 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
84/12 = 84 × 7/12 × 7 = 588/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
21/7 = 21 × 12/7 × 12 = 252/84 - Add the two like fractions:
588/84 + 252/84 = 588 + 252/84 = 840/84 - 840/84 simplified gives 10/1
- So, 84/12 + 21/7 = 10/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/12+42/7 84/24+21/7 84/12+21/14 84/12+63/7 84/36+21/7 84/60+21/7 84/12+21/35 84/12+21/49