Add 5/8 and 15/21
5/8 + 15/21 is 75/56.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 8 × 21 = 168,
5/8 = 5 × 21/8 × 21 = 105/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
15/21 = 15 × 8/21 × 8 = 120/168 - Add the two like fractions:
105/168 + 120/168 = 105 + 120/168 = 225/168 - 225/168 simplified gives 75/56
- So, 5/8 + 15/21 = 75/56
In mixed form: 119/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/8+15/21 5/8+30/21 5/16+15/21 5/8+15/42 15/8+15/21 5/8+45/21 5/24+15/21 5/8+15/63 25/8+15/21 5/8+75/21 5/40+15/21 35/8+15/21 5/56+15/21