Add 42/2 and 21/15
1st number: 21 0/2, 2nd number: 1 6/15
42/2 + 21/15 is 112/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 15 is 30
Next, find the equivalent fraction of both fractional numbers with denominator 30 - For the 1st fraction, since 2 × 15 = 30,
42/2 = 42 × 15/2 × 15 = 630/30 - Likewise, for the 2nd fraction, since 15 × 2 = 30,
21/15 = 21 × 2/15 × 2 = 42/30 - Add the two like fractions:
630/30 + 42/30 = 630 + 42/30 = 672/30 - 672/30 simplified gives 112/5
- So, 42/2 + 21/15 = 112/5
In mixed form: 222/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/2+21/15 42/2+42/15 42/4+21/15 42/2+21/30 42/2+63/15 42/6+21/15 42/2+21/45 42/10+21/15 42/2+21/75 42/14+21/15