Add 2/8 and 1/21
2/8 + 1/21 is 25/84.
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,
2/8 = 2 × 21/8 × 21 = 42/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
1/21 = 1 × 8/21 × 8 = 8/168 - Add the two like fractions:
42/168 + 8/168 = 42 + 8/168 = 50/168 - 50/168 simplified gives 25/84
- So, 2/8 + 1/21 = 25/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/8+1/21 2/8+2/21 2/16+1/21 2/8+1/42 6/8+1/21 2/8+3/21 2/24+1/21 2/8+1/63 10/8+1/21 2/8+5/21 2/40+1/21 14/8+1/21 2/8+7/21 2/56+1/21