Add 21/2 and 42/16
1st number: 10 1/2, 2nd number: 2 10/16
21/2 + 42/16 is 105/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 16 is 16
Next, find the equivalent fraction of both fractional numbers with denominator 16 - For the 1st fraction, since 2 × 8 = 16,
21/2 = 21 × 8/2 × 8 = 168/16 - Likewise, for the 2nd fraction, since 16 × 1 = 16,
42/16 = 42 × 1/16 × 1 = 42/16 - Add the two like fractions:
168/16 + 42/16 = 168 + 42/16 = 210/16 - 210/16 simplified gives 105/8
- So, 21/2 + 42/16 = 105/8
In mixed form: 131/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/2+42/16 21/2+84/16 21/4+42/16 21/2+42/32 63/2+42/16 21/6+42/16 21/2+42/48 21/10+42/16 21/2+42/80 21/14+42/16