Add 1/8 and 28/21
1st number: 1/8, 2nd number: 1 7/21
1/8 + 28/21 is 35/24.
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,
1/8 = 1 × 21/8 × 21 = 21/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
28/21 = 28 × 8/21 × 8 = 224/168 - Add the two like fractions:
21/168 + 224/168 = 21 + 224/168 = 245/168 - 245/168 simplified gives 35/24
- So, 1/8 + 28/21 = 35/24
In mixed form: 111/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/8+28/21 1/8+56/21 1/16+28/21 1/8+28/42 3/8+28/21 1/8+84/21 1/24+28/21 1/8+28/63 5/8+28/21 1/40+28/21 7/8+28/21 1/56+28/21