Add 20/42 and 21/24
20/42 + 21/24 is 227/168.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 24 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 42 × 4 = 168,
20/42 = 20 × 4/42 × 4 = 80/168 - Likewise, for the 2nd fraction, since 24 × 7 = 168,
21/24 = 21 × 7/24 × 7 = 147/168 - Add the two like fractions:
80/168 + 147/168 = 80 + 147/168 = 227/168 - So, 20/42 + 21/24 = 227/168
In mixed form: 159/168
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/42+21/24 20/42+42/24 20/84+21/24 20/42+21/48 60/42+21/24 20/42+63/24 20/42+21/72