Add 9/10 and 8/21
9/10 + 8/21 is 269/210.
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,
9/10 = 9 × 21/10 × 21 = 189/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
8/21 = 8 × 10/21 × 10 = 80/210 - Add the two like fractions:
189/210 + 80/210 = 189 + 80/210 = 269/210 - So, 9/10 + 8/21 = 269/210
In mixed form: 159/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/10+8/21 9/10+16/21 9/20+8/21 9/10+8/42 27/10+8/21 9/10+24/21 9/30+8/21 9/10+8/63 45/10+8/21 9/10+40/21 9/50+8/21 63/10+8/21 9/10+56/21 9/70+8/21