Add 12/42 and 40/84
12/42 + 40/84 is 16/21.
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,
12/42 = 12 × 2/42 × 2 = 24/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
40/84 = 40 × 1/84 × 1 = 40/84 - Add the two like fractions:
24/84 + 40/84 = 24 + 40/84 = 64/84 - 64/84 simplified gives 16/21
- So, 12/42 + 40/84 = 16/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/42+40/84 12/42+80/84 12/84+40/84 36/42+40/84 60/42+40/84 84/42+40/84