Add 30/90 and 18/7
1st number: 30/90, 2nd number: 2 4/7
30/90 + 18/7 is 61/21.
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,
18/7 = 18 × 90/7 × 90 = 1620/630 - Add the two like fractions:
210/630 + 1620/630 = 210 + 1620/630 = 1830/630 - 1830/630 simplified gives 61/21
- So, 30/90 + 18/7 = 61/21
In mixed form: 219/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/90+18/7 30/90+36/7 30/90+18/14 30/90+54/7 30/90+18/21 30/90+90/7 30/90+18/35 30/90+18/49