Add 5/12 and 21/42
5/12 + 21/42 is 11/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 42 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
5/12 = 5 × 7/12 × 7 = 35/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
21/42 = 21 × 2/42 × 2 = 42/84 - Add the two like fractions:
35/84 + 42/84 = 35 + 42/84 = 77/84 - 77/84 simplified gives 11/12
- So, 5/12 + 21/42 = 11/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/12+21/42 5/24+21/42 5/12+21/84 15/12+21/42 5/12+63/42 5/36+21/42 25/12+21/42 5/60+21/42 35/12+21/42 5/84+21/42