Add 28/4 and 5/21
1st number: 7 0/4, 2nd number: 5/21
28/4 + 5/21 is 152/21.
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,
28/4 = 28 × 21/4 × 21 = 588/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
5/21 = 5 × 4/21 × 4 = 20/84 - Add the two like fractions:
588/84 + 20/84 = 588 + 20/84 = 608/84 - 608/84 simplified gives 152/21
- So, 28/4 + 5/21 = 152/21
In mixed form: 75/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/4+5/21 28/4+10/21 28/8+5/21 28/4+5/42 84/4+5/21 28/4+15/21 28/12+5/21 28/4+5/63 28/4+25/21 28/20+5/21 28/4+35/21