Add 16/21 and 3/12
16/21 + 3/12 is 85/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
16/21 = 16 × 4/21 × 4 = 64/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
3/12 = 3 × 7/12 × 7 = 21/84 - Add the two like fractions:
64/84 + 21/84 = 64 + 21/84 = 85/84 - So, 16/21 + 3/12 = 85/84
In mixed form: 11/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/21+3/12 16/21+6/12 16/42+3/12 16/21+3/24 48/21+3/12 16/21+9/12 16/63+3/12 16/21+3/36 80/21+3/12 16/21+15/12 16/21+3/60 16/21+21/12 16/21+3/84