Add 20/28 and 84/42
1st number: 20/28, 2nd number: 2 0/42
20/28 + 84/42 is 19/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
20/28 = 20 × 3/28 × 3 = 60/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
84/42 = 84 × 2/42 × 2 = 168/84 - Add the two like fractions:
60/84 + 168/84 = 60 + 168/84 = 228/84 - 228/84 simplified gives 19/7
- So, 20/28 + 84/42 = 19/7
In mixed form: 25/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/28+84/42 20/56+84/42 60/28+84/42 20/84+84/42