Add 30/90 and 9/7
1st number: 30/90, 2nd number: 1 2/7
30/90 + 9/7 is 34/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 7 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 90 × 7 = 630,
30/90 = 30 × 7/90 × 7 = 210/630 - Likewise, for the 2nd fraction, since 7 × 90 = 630,
9/7 = 9 × 90/7 × 90 = 810/630 - Add the two like fractions:
210/630 + 810/630 = 210 + 810/630 = 1020/630 - 1020/630 simplified gives 34/21
- So, 30/90 + 9/7 = 34/21
In mixed form: 113/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/90+9/7 30/90+18/7 30/90+9/14 30/90+27/7 30/90+9/21 30/90+45/7 30/90+9/35 30/90+63/7 30/90+9/49