Add 18/42 and 5/20
18/42 + 5/20 is 19/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,
18/42 = 18 × 10/42 × 10 = 180/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
5/20 = 5 × 21/20 × 21 = 105/420 - Add the two like fractions:
180/420 + 105/420 = 180 + 105/420 = 285/420 - 285/420 simplified gives 19/28
- So, 18/42 + 5/20 = 19/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/42+5/20 18/42+10/20 18/84+5/20 18/42+5/40 54/42+5/20 18/42+15/20 18/42+5/60 90/42+5/20 18/42+25/20 18/42+35/20