Add 3/21 and 18/7
1st number: 3/21, 2nd number: 2 4/7
3/21 + 18/7 is 19/7.
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,
3/21 = 3 × 1/21 × 1 = 3/21 - Likewise, for the 2nd fraction, since 7 × 3 = 21,
18/7 = 18 × 3/7 × 3 = 54/21 - Add the two like fractions:
3/21 + 54/21 = 3 + 54/21 = 57/21 - 57/21 simplified gives 19/7
- So, 3/21 + 18/7 = 19/7
In mixed form: 25/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/21+18/7 3/21+36/7 3/42+18/7 3/21+18/14 9/21+18/7 3/21+54/7 3/63+18/7 3/21+18/21 15/21+18/7 3/21+90/7 3/21+18/35 3/21+18/49