Add 9/42 and 20/21
9/42 + 20/21 is 7/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
9/42 = 9 × 1/42 × 1 = 9/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
20/21 = 20 × 2/21 × 2 = 40/42 - Add the two like fractions:
9/42 + 40/42 = 9 + 40/42 = 49/42 - 49/42 simplified gives 7/6
- So, 9/42 + 20/21 = 7/6
In mixed form: 11/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/42+20/21 9/42+40/21 9/84+20/21 9/42+20/42 27/42+20/21 9/42+60/21 9/42+20/63 45/42+20/21 63/42+20/21