Add 12/20 and 84/42
1st number: 12/20, 2nd number: 2 0/42
12/20 + 84/42 is 13/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
12/20 = 12 × 21/20 × 21 = 252/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
84/42 = 84 × 10/42 × 10 = 840/420 - Add the two like fractions:
252/420 + 840/420 = 252 + 840/420 = 1092/420 - 1092/420 simplified gives 13/5
- So, 12/20 + 84/42 = 13/5
In mixed form: 23/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/20+84/42 12/40+84/42 36/20+84/42 12/60+84/42 60/20+84/42 84/20+84/42