Add 21/84 and 12/14
21/84 + 12/14 is 31/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 14 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 14 × 6 = 84,
12/14 = 12 × 6/14 × 6 = 72/84 - Add the two like fractions:
21/84 + 72/84 = 21 + 72/84 = 93/84 - 93/84 simplified gives 31/28
- So, 21/84 + 12/14 = 31/28
In mixed form: 13/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+12/14 21/84+24/14 21/84+12/28 63/84+12/14 21/84+36/14 21/84+12/42 21/84+60/14 21/84+12/70 21/84+84/14 21/84+12/98