Add 40/84 and 28/42
40/84 + 28/42 is 8/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
40/84 = 40 × 1/84 × 1 = 40/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
28/42 = 28 × 2/42 × 2 = 56/84 - Add the two like fractions:
40/84 + 56/84 = 40 + 56/84 = 96/84 - 96/84 simplified gives 8/7
- So, 40/84 + 28/42 = 8/7
In mixed form: 11/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/84+28/42 40/84+56/42 40/84+28/84 40/84+84/42