Add 18/21 and 70/30
1st number: 18/21, 2nd number: 2 10/30
18/21 + 70/30 is 67/21.
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,
70/30 = 70 × 7/30 × 7 = 490/210 - Add the two like fractions:
180/210 + 490/210 = 180 + 490/210 = 670/210 - 670/210 simplified gives 67/21
- So, 18/21 + 70/30 = 67/21
In mixed form: 34/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+70/30 18/42+70/30 18/21+70/60 54/21+70/30 18/63+70/30 18/21+70/90 90/21+70/30