Add 1/21 and 18/5
1st number: 1/21, 2nd number: 3 3/5
1/21 + 18/5 is 383/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 5 is 105
Next, find the equivalent fraction of both fractional numbers with denominator 105 - For the 1st fraction, since 21 × 5 = 105,
1/21 = 1 × 5/21 × 5 = 5/105 - Likewise, for the 2nd fraction, since 5 × 21 = 105,
18/5 = 18 × 21/5 × 21 = 378/105 - Add the two like fractions:
5/105 + 378/105 = 5 + 378/105 = 383/105 - So, 1/21 + 18/5 = 383/105
In mixed form: 368/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/21+18/5 1/21+36/5 1/42+18/5 1/21+18/10 3/21+18/5 1/21+54/5 1/63+18/5 1/21+18/15 5/21+18/5 1/21+90/5 1/21+18/25 7/21+18/5 1/21+18/35