Add 9/42 and 27/21
1st number: 9/42, 2nd number: 1 6/21
9/42 + 27/21 is 3/2.
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,
27/21 = 27 × 2/21 × 2 = 54/42 - Add the two like fractions:
9/42 + 54/42 = 9 + 54/42 = 63/42 - 63/42 simplified gives 3/2
- So, 9/42 + 27/21 = 3/2
In mixed form: 11/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/42+27/21 9/42+54/21 9/84+27/21 9/42+27/42 27/42+27/21 9/42+81/21 9/42+27/63 45/42+27/21 63/42+27/21