Add 3/42 and 12/20
3/42 + 12/20 is 47/70.
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,
3/42 = 3 × 10/42 × 10 = 30/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
12/20 = 12 × 21/20 × 21 = 252/420 - Add the two like fractions:
30/420 + 252/420 = 30 + 252/420 = 282/420 - 282/420 simplified gives 47/70
- So, 3/42 + 12/20 = 47/70
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/42+12/20 3/42+24/20 3/84+12/20 3/42+12/40 9/42+12/20 3/42+36/20 3/42+12/60 15/42+12/20 3/42+60/20 21/42+12/20 3/42+84/20