Add 3/42 and 28/21
1st number: 3/42, 2nd number: 1 7/21
3/42 + 28/21 is 59/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
3/42 = 3 × 1/42 × 1 = 3/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
28/21 = 28 × 2/21 × 2 = 56/42 - Add the two like fractions:
3/42 + 56/42 = 3 + 56/42 = 59/42 - So, 3/42 + 28/21 = 59/42
In mixed form: 117/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/42+28/21 3/42+56/21 3/84+28/21 3/42+28/42 9/42+28/21 3/42+84/21 3/42+28/63 15/42+28/21 21/42+28/21