Add 16/21 and 8/9
16/21 + 8/9 is 104/63.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 9 is 63
Next, find the equivalent fraction of both fractional numbers with denominator 63 - For the 1st fraction, since 21 × 3 = 63,
16/21 = 16 × 3/21 × 3 = 48/63 - Likewise, for the 2nd fraction, since 9 × 7 = 63,
8/9 = 8 × 7/9 × 7 = 56/63 - Add the two like fractions:
48/63 + 56/63 = 48 + 56/63 = 104/63 - So, 16/21 + 8/9 = 104/63
In mixed form: 141/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/21+8/9 16/21+16/9 16/42+8/9 16/21+8/18 48/21+8/9 16/21+24/9 16/63+8/9 16/21+8/27 80/21+8/9 16/21+40/9 16/21+8/45 16/21+56/9 16/21+8/63