Add 18/21 and 35/30
1st number: 18/21, 2nd number: 1 5/30
18/21 + 35/30 is 85/42.
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,
35/30 = 35 × 7/30 × 7 = 245/210 - Add the two like fractions:
180/210 + 245/210 = 180 + 245/210 = 425/210 - 425/210 simplified gives 85/42
- So, 18/21 + 35/30 = 85/42
In mixed form: 21/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+35/30 18/21+70/30 18/42+35/30 18/21+35/60 54/21+35/30 18/63+35/30 18/21+35/90 90/21+35/30