Add 20/40 and 42/12
1st number: 20/40, 2nd number: 3 6/12
20/40 + 42/12 is 4/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 12 is 120
Next, find the equivalent fraction of both fractional numbers with denominator 120 - For the 1st fraction, since 40 × 3 = 120,
20/40 = 20 × 3/40 × 3 = 60/120 - Likewise, for the 2nd fraction, since 12 × 10 = 120,
42/12 = 42 × 10/12 × 10 = 420/120 - Add the two like fractions:
60/120 + 420/120 = 60 + 420/120 = 480/120 - 480/120 simplified gives 4/1
- So, 20/40 + 42/12 = 4/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/40+84/12 20/80+42/12 20/40+42/24 60/40+42/12 20/40+42/36 20/40+42/60 20/40+42/84