Add 20/24 and 21/42
20/24 + 21/42 is 4/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 42 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 24 × 7 = 168,
20/24 = 20 × 7/24 × 7 = 140/168 - Likewise, for the 2nd fraction, since 42 × 4 = 168,
21/42 = 21 × 4/42 × 4 = 84/168 - Add the two like fractions:
140/168 + 84/168 = 140 + 84/168 = 224/168 - 224/168 simplified gives 4/3
- So, 20/24 + 21/42 = 4/3
In mixed form: 11/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/24+21/42 20/48+21/42 20/24+21/84 60/24+21/42 20/24+63/42 20/72+21/42