Add 80/42 and 9/90
1st number: 1 38/42, 2nd number: 9/90
80/42 + 9/90 is 421/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 42 × 15 = 630,
80/42 = 80 × 15/42 × 15 = 1200/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
9/90 = 9 × 7/90 × 7 = 63/630 - Add the two like fractions:
1200/630 + 63/630 = 1200 + 63/630 = 1263/630 - 1263/630 simplified gives 421/210
- So, 80/42 + 9/90 = 421/210
In mixed form: 21/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/42+18/90 80/84+9/90 80/42+27/90 80/42+45/90 80/42+63/90