Add 80/42 and 40/7
1st number: 1 38/42, 2nd number: 5 5/7
80/42 + 40/7 is 160/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 7 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
80/42 = 80 × 1/42 × 1 = 80/42 - Likewise, for the 2nd fraction, since 7 × 6 = 42,
40/7 = 40 × 6/7 × 6 = 240/42 - Add the two like fractions:
80/42 + 240/42 = 80 + 240/42 = 320/42 - 320/42 simplified gives 160/21
- So, 80/42 + 40/7 = 160/21
In mixed form: 713/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/42+80/7 80/84+40/7 80/42+40/14 80/42+40/21 80/42+40/35 80/42+40/49