Add 2/8 and 5/21
2/8 + 5/21 is 41/84.
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,
5/21 = 5 × 8/21 × 8 = 40/168 - Add the two like fractions:
42/168 + 40/168 = 42 + 40/168 = 82/168 - 82/168 simplified gives 41/84
- So, 2/8 + 5/21 = 41/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/8+5/21 2/8+10/21 2/16+5/21 2/8+5/42 6/8+5/21 2/8+15/21 2/24+5/21 2/8+5/63 10/8+5/21 2/8+25/21 2/40+5/21 14/8+5/21 2/8+35/21 2/56+5/21