Add 40/42 and 5/80
40/42 + 5/80 is 341/336.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 80 is 1680
Next, find the equivalent fraction of both fractional numbers with denominator 1680 - For the 1st fraction, since 42 × 40 = 1680,
40/42 = 40 × 40/42 × 40 = 1600/1680 - Likewise, for the 2nd fraction, since 80 × 21 = 1680,
5/80 = 5 × 21/80 × 21 = 105/1680 - Add the two like fractions:
1600/1680 + 105/1680 = 1600 + 105/1680 = 1705/1680 - 1705/1680 simplified gives 341/336
- So, 40/42 + 5/80 = 341/336
In mixed form: 15/336
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/42+5/80 40/42+10/80 40/84+5/80 40/42+15/80 40/42+25/80 40/42+35/80