Add 3/42 and 12/21
3/42 + 12/21 is 9/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
3/42 = 3 × 1/42 × 1 = 3/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
12/21 = 12 × 2/21 × 2 = 24/42 - Add the two like fractions:
3/42 + 24/42 = 3 + 24/42 = 27/42 - 27/42 simplified gives 9/14
- So, 3/42 + 12/21 = 9/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/42+12/21 3/42+24/21 3/84+12/21 3/42+12/42 9/42+12/21 3/42+36/21 3/42+12/63 15/42+12/21 3/42+60/21 21/42+12/21 3/42+84/21