Add 9/42 and 15/20
9/42 + 15/20 is 27/28.
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,
9/42 = 9 × 10/42 × 10 = 90/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
15/20 = 15 × 21/20 × 21 = 315/420 - Add the two like fractions:
90/420 + 315/420 = 90 + 315/420 = 405/420 - 405/420 simplified gives 27/28
- So, 9/42 + 15/20 = 27/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/42+15/20 9/42+30/20 9/84+15/20 9/42+15/40 27/42+15/20 9/42+45/20 9/42+15/60 45/42+15/20 9/42+75/20 63/42+15/20