Add 12/42 and 12/20
12/42 + 12/20 is 31/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,
12/42 = 12 × 10/42 × 10 = 120/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
12/20 = 12 × 21/20 × 21 = 252/420 - Add the two like fractions:
120/420 + 252/420 = 120 + 252/420 = 372/420 - 372/420 simplified gives 31/35
- So, 12/42 + 12/20 = 31/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 24/42+12/20 12/42+24/20 12/84+12/20 12/42+12/40 36/42+12/20 12/42+36/20 12/42+12/60 60/42+12/20 12/42+60/20 84/42+12/20 12/42+84/20