Add 90/42 and 9/21
1st number: 2 6/42, 2nd number: 9/21
90/42 + 9/21 is 18/7.
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,
90/42 = 90 × 1/42 × 1 = 90/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
9/21 = 9 × 2/21 × 2 = 18/42 - Add the two like fractions:
90/42 + 18/42 = 90 + 18/42 = 108/42 - 108/42 simplified gives 18/7
- So, 90/42 + 9/21 = 18/7
In mixed form: 24/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/42+18/21 90/84+9/21 90/42+9/42 90/42+27/21 90/42+9/63 90/42+45/21 90/42+63/21