Add 21/84 and 14/7
1st number: 21/84, 2nd number: 2 0/7
21/84 + 14/7 is 9/4.
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,
21/84 = 21 × 1/84 × 1 = 21/84 - Likewise, for the 2nd fraction, since 7 × 12 = 84,
14/7 = 14 × 12/7 × 12 = 168/84 - Add the two like fractions:
21/84 + 168/84 = 21 + 168/84 = 189/84 - 189/84 simplified gives 9/4
- So, 21/84 + 14/7 = 9/4
In mixed form: 21/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+14/7 21/84+28/7 63/84+14/7 21/84+42/7 21/84+14/21 21/84+70/7 21/84+14/35 21/84+98/7 21/84+14/49