Add 18/21 and 36/30
1st number: 18/21, 2nd number: 1 6/30
18/21 + 36/30 is 72/35.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 30 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 21 × 10 = 210,
18/21 = 18 × 10/21 × 10 = 180/210 - Likewise, for the 2nd fraction, since 30 × 7 = 210,
36/30 = 36 × 7/30 × 7 = 252/210 - Add the two like fractions:
180/210 + 252/210 = 180 + 252/210 = 432/210 - 432/210 simplified gives 72/35
- So, 18/21 + 36/30 = 72/35
In mixed form: 22/35
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+36/30 18/21+72/30 18/42+36/30 18/21+36/60 54/21+36/30 18/63+36/30 18/21+36/90 90/21+36/30