Add 4/12 and 21/42
4/12 + 21/42 is 5/6.
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,
4/12 = 4 × 7/12 × 7 = 28/84 - Likewise, for the 2nd fraction, since 42 × 2 = 84,
21/42 = 21 × 2/42 × 2 = 42/84 - Add the two like fractions:
28/84 + 42/84 = 28 + 42/84 = 70/84 - 70/84 simplified gives 5/6
- So, 4/12 + 21/42 = 5/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/12+21/42 4/24+21/42 4/12+21/84 4/12+63/42 4/36+21/42 20/12+21/42 4/60+21/42 28/12+21/42 4/84+21/42