Add 9/42 and 90/20
1st number: 9/42, 2nd number: 4 10/20
9/42 + 90/20 is 33/7.
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,
90/20 = 90 × 21/20 × 21 = 1890/420 - Add the two like fractions:
90/420 + 1890/420 = 90 + 1890/420 = 1980/420 - 1980/420 simplified gives 33/7
- So, 9/42 + 90/20 = 33/7
In mixed form: 45/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/42+90/20 9/84+90/20 9/42+90/40 27/42+90/20 9/42+90/60 45/42+90/20 63/42+90/20