Add 15/21 and 42/16
1st number: 15/21, 2nd number: 2 10/16
15/21 + 42/16 is 187/56.
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,
15/21 = 15 × 16/21 × 16 = 240/336 - Likewise, for the 2nd fraction, since 16 × 21 = 336,
42/16 = 42 × 21/16 × 21 = 882/336 - Add the two like fractions:
240/336 + 882/336 = 240 + 882/336 = 1122/336 - 1122/336 simplified gives 187/56
- So, 15/21 + 42/16 = 187/56
In mixed form: 319/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21+42/16 15/21+84/16 15/42+42/16 15/21+42/32 45/21+42/16 15/63+42/16 15/21+42/48 75/21+42/16 15/21+42/80