Add 28/42 and 84/20
1st number: 28/42, 2nd number: 4 4/20
28/42 + 84/20 is 73/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,
28/42 = 28 × 10/42 × 10 = 280/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
84/20 = 84 × 21/20 × 21 = 1764/420 - Add the two like fractions:
280/420 + 1764/420 = 280 + 1764/420 = 2044/420 - 2044/420 simplified gives 73/15
- So, 28/42 + 84/20 = 73/15
In mixed form: 413/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/42+84/20 28/84+84/20 28/42+84/40 84/42+84/20 28/42+84/60