Add 8/21 and 18/4
1st number: 8/21, 2nd number: 4 2/4
8/21 + 18/4 is 205/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
8/21 = 8 × 4/21 × 4 = 32/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
18/4 = 18 × 21/4 × 21 = 378/84 - Add the two like fractions:
32/84 + 378/84 = 32 + 378/84 = 410/84 - 410/84 simplified gives 205/42
- So, 8/21 + 18/4 = 205/42
In mixed form: 437/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21+18/4 8/21+36/4 8/42+18/4 8/21+18/8 24/21+18/4 8/21+54/4 8/63+18/4 8/21+18/12 40/21+18/4 8/21+90/4 8/21+18/20 56/21+18/4 8/21+18/28