Add 40/42 and 4/12
40/42 + 4/12 is 9/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
40/42 = 40 × 2/42 × 2 = 80/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
4/12 = 4 × 7/12 × 7 = 28/84 - Add the two like fractions:
80/84 + 28/84 = 80 + 28/84 = 108/84 - 108/84 simplified gives 9/7
- So, 40/42 + 4/12 = 9/7
In mixed form: 12/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/42+4/12 40/42+8/12 40/84+4/12 40/42+4/24 40/42+4/36 40/42+20/12 40/42+4/60 40/42+28/12 40/42+4/84