Add 42/84 and 21/16
1st number: 42/84, 2nd number: 1 5/16
42/84 + 21/16 is 29/16.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 16 is 336
Next, find the equivalent fraction of both fractional numbers with denominator 336 - For the 1st fraction, since 84 × 4 = 336,
42/84 = 42 × 4/84 × 4 = 168/336 - Likewise, for the 2nd fraction, since 16 × 21 = 336,
21/16 = 21 × 21/16 × 21 = 441/336 - Add the two like fractions:
168/336 + 441/336 = 168 + 441/336 = 609/336 - 609/336 simplified gives 29/16
- So, 42/84 + 21/16 = 29/16
In mixed form: 113/16
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+42/16 42/84+21/32 42/84+63/16 42/84+21/48 42/84+21/80