Add 80/84 and 12/30
80/84 + 12/30 is 142/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 30 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
80/84 = 80 × 5/84 × 5 = 400/420 - Likewise, for the 2nd fraction, since 30 × 14 = 420,
12/30 = 12 × 14/30 × 14 = 168/420 - Add the two like fractions:
400/420 + 168/420 = 400 + 168/420 = 568/420 - 568/420 simplified gives 142/105
- So, 80/84 + 12/30 = 142/105
In mixed form: 137/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/84+24/30 80/84+12/60 80/84+36/30 80/84+12/90 80/84+60/30 80/84+84/30