Add 12/42 and 20/5
1st number: 12/42, 2nd number: 4 0/5
12/42 + 20/5 is 30/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 5 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 42 × 5 = 210,
12/42 = 12 × 5/42 × 5 = 60/210 - Likewise, for the 2nd fraction, since 5 × 42 = 210,
20/5 = 20 × 42/5 × 42 = 840/210 - Add the two like fractions:
60/210 + 840/210 = 60 + 840/210 = 900/210 - 900/210 simplified gives 30/7
- So, 12/42 + 20/5 = 30/7
In mixed form: 42/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/42+20/5 12/42+40/5 12/84+20/5 12/42+20/10 36/42+20/5 12/42+60/5 12/42+20/15 60/42+20/5 12/42+20/25 84/42+20/5 12/42+20/35