Add 21/30 and 8/21
21/30 + 8/21 is 227/210.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 21 is 210
Next, find the equivalent fraction of both fractional numbers with denominator 210 - For the 1st fraction, since 30 × 7 = 210,
21/30 = 21 × 7/30 × 7 = 147/210 - Likewise, for the 2nd fraction, since 21 × 10 = 210,
8/21 = 8 × 10/21 × 10 = 80/210 - Add the two like fractions:
147/210 + 80/210 = 147 + 80/210 = 227/210 - So, 21/30 + 8/21 = 227/210
In mixed form: 117/210
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/30+8/21 21/30+16/21 21/60+8/21 21/30+8/42 63/30+8/21 21/30+24/21 21/90+8/21 21/30+8/63 21/30+40/21 21/30+56/21