Add 8/10 and 5/21
8/10 + 5/21 is 109/105.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 10 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 10 × 21 = 210,
8/10 = 8 × 21/10 × 21 = 168/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
5/21 = 5 × 10/21 × 10 = 50/210 - Add the two like fractions:
168/210 + 50/210 = 168 + 50/210 = 218/210 - 218/210 simplified gives 109/105
- So, 8/10 + 5/21 = 109/105
In mixed form: 14/105
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/10+5/21 8/10+10/21 8/20+5/21 8/10+5/42 24/10+5/21 8/10+15/21 8/30+5/21 8/10+5/63 40/10+5/21 8/10+25/21 8/50+5/21 56/10+5/21 8/10+35/21 8/70+5/21