Add 18/24 and 30/21
1st number: 18/24, 2nd number: 1 9/21
18/24 + 30/21 is 61/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 24 × 7 = 168,
18/24 = 18 × 7/24 × 7 = 126/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
30/21 = 30 × 8/21 × 8 = 240/168 - Add the two like fractions:
126/168 + 240/168 = 126 + 240/168 = 366/168 - 366/168 simplified gives 61/28
- So, 18/24 + 30/21 = 61/28
In mixed form: 25/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/24+30/21 18/24+60/21 18/48+30/21 18/24+30/42 54/24+30/21 18/24+90/21 18/72+30/21 18/24+30/63 90/24+30/21