Add 18/30 and 24/21
1st number: 18/30, 2nd number: 1 3/21
18/30 + 24/21 is 61/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
18/30 = 18 × 7/30 × 7 = 126/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
24/21 = 24 × 10/21 × 10 = 240/210 - Add the two like fractions:
126/210 + 240/210 = 126 + 240/210 = 366/210 - 366/210 simplified gives 61/35
- So, 18/30 + 24/21 = 61/35
In mixed form: 126/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/30+24/21 18/30+48/21 18/60+24/21 18/30+24/42 54/30+24/21 18/30+72/21 18/90+24/21 18/30+24/63 90/30+24/21