Add 18/21 and 30/4
1st number: 18/21, 2nd number: 7 2/4
18/21 + 30/4 is 117/14.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
18/21 = 18 × 4/21 × 4 = 72/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
30/4 = 30 × 21/4 × 21 = 630/84 - Add the two like fractions:
72/84 + 630/84 = 72 + 630/84 = 702/84 - 702/84 simplified gives 117/14
- So, 18/21 + 30/4 = 117/14
In mixed form: 85/14
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+30/4 18/21+60/4 18/42+30/4 18/21+30/8 54/21+30/4 18/21+90/4 18/63+30/4 18/21+30/12 90/21+30/4 18/21+30/20 18/21+30/28