Add 84/42 and 72/84
1st number: 2 0/42, 2nd number: 72/84
84/42 + 72/84 is 20/7.
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,
84/42 = 84 × 2/42 × 2 = 168/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
72/84 = 72 × 1/84 × 1 = 72/84 - Add the two like fractions:
168/84 + 72/84 = 168 + 72/84 = 240/84 - 240/84 simplified gives 20/7
- So, 84/42 + 72/84 = 20/7
In mixed form: 26/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: