Add 12/84 and 18/20
12/84 + 18/20 is 73/70.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 84 × 5 = 420,
12/84 = 12 × 5/84 × 5 = 60/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
18/20 = 18 × 21/20 × 21 = 378/420 - Add the two like fractions:
60/420 + 378/420 = 60 + 378/420 = 438/420 - 438/420 simplified gives 73/70
- So, 12/84 + 18/20 = 73/70
In mixed form: 13/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/84+18/20 12/84+36/20 12/84+18/40 36/84+18/20 12/84+54/20 12/84+18/60 60/84+18/20 12/84+90/20