Add 1/8 and 3/21
1/8 + 3/21 is 15/56.
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,
1/8 = 1 × 21/8 × 21 = 21/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
3/21 = 3 × 8/21 × 8 = 24/168 - Add the two like fractions:
21/168 + 24/168 = 21 + 24/168 = 45/168 - 45/168 simplified gives 15/56
- So, 1/8 + 3/21 = 15/56
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 2/8+3/21 1/8+6/21 1/16+3/21 1/8+3/42 3/8+3/21 1/8+9/21 1/24+3/21 1/8+3/63 5/8+3/21 1/8+15/21 1/40+3/21 7/8+3/21 1/56+3/21