Add 12/21 and 21/16
1st number: 12/21, 2nd number: 1 5/16
12/21 + 21/16 is 211/112.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 16 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 21 × 16 = 336,
12/21 = 12 × 16/21 × 16 = 192/336 - Likewise, for the 2nd fraction, since 16 × 21 = 336,
21/16 = 21 × 21/16 × 21 = 441/336 - Add the two like fractions:
192/336 + 441/336 = 192 + 441/336 = 633/336 - 633/336 simplified gives 211/112
- So, 12/21 + 21/16 = 211/112
In mixed form: 199/112
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/21+21/16 12/21+42/16 12/42+21/16 12/21+21/32 36/21+21/16 12/21+63/16 12/63+21/16 12/21+21/48 60/21+21/16 12/21+21/80 84/21+21/16