Add 8/4 and 12/21
1st number: 2 0/4, 2nd number: 12/21
8/4 + 12/21 is 18/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
8/4 = 8 × 21/4 × 21 = 168/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
12/21 = 12 × 4/21 × 4 = 48/84 - Add the two like fractions:
168/84 + 48/84 = 168 + 48/84 = 216/84 - 216/84 simplified gives 18/7
- So, 8/4 + 12/21 = 18/7
In mixed form: 24/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/4+12/21 8/4+24/21 8/4+12/42 24/4+12/21 8/4+36/21 8/12+12/21 8/4+12/63 40/4+12/21 8/4+60/21 8/20+12/21 56/4+12/21 8/4+84/21 8/28+12/21