Add 72/42 and 28/84
1st number: 1 30/42, 2nd number: 28/84
72/42 + 28/84 is 43/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
72/42 = 72 × 2/42 × 2 = 144/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
28/84 = 28 × 1/84 × 1 = 28/84 - Add the two like fractions:
144/84 + 28/84 = 144 + 28/84 = 172/84 - 172/84 simplified gives 43/21
- So, 72/42 + 28/84 = 43/21
In mixed form: 21/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/42+56/84 72/84+28/84