Add 30/21 and 18/7
1st number: 1 9/21, 2nd number: 2 4/7
30/21 + 18/7 is 4/1.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 7 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 21 × 1 = 21,
30/21 = 30 × 1/21 × 1 = 30/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
18/7 = 18 × 3/7 × 3 = 54/21 - Add the two like fractions:
30/21 + 54/21 = 30 + 54/21 = 84/21 - 84/21 simplified gives 4/1
- So, 30/21 + 18/7 = 4/1
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/21+18/7 30/21+36/7 30/42+18/7 30/21+18/14 90/21+18/7 30/21+54/7 30/63+18/7 30/21+18/21 30/21+90/7 30/21+18/35 30/21+18/49