Add 21/14 and 30/90
1st number: 1 7/14, 2nd number: 30/90
21/14 + 30/90 is 11/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 14 and 90 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 14 × 45 = 630,
21/14 = 21 × 45/14 × 45 = 945/630 - Likewise, for the 2nd fraction, since 90 × 7 = 630,
30/90 = 30 × 7/90 × 7 = 210/630 - Add the two like fractions:
945/630 + 210/630 = 945 + 210/630 = 1155/630 - 1155/630 simplified gives 11/6
- So, 21/14 + 30/90 = 11/6
In mixed form: 15/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/14+30/90 21/14+60/90 21/28+30/90 63/14+30/90 21/42+30/90 21/70+30/90 21/98+30/90