It is: 9/21 = 3/7 simplified
Nine over 21 in its simplest form is 3/7
3/7
21/9 = 7/3 = 21/3
Common factor is seven. So it is 3 over nine
21/9 - 1/2 = 1.8333
6/7 ÷ 9/10 = 60/63 simplfied as 20/21.
23/9 = 21/3 = 7/3
Brooklyn Nine-Nine - 2013 Unsolvable 1-21 was released on: USA: 18 March 2014
1/4 + 3/9 = 9/36 + 12/36 = 21/36 = 7/12
21
21
Since our numerical system is based upon 10 digits, every number divided by nine wil cause an infinite loop of numbers one over nine is 0.1111111... two over nine is 0.22222222... since eighth over nine is 0.888888888... nine over nine is 0.99999999... but nine over nine is 1 so in your case eleven over nine will cause a infinite loop of 1.222222222222222222... Point is an accurate decimal form of eleven over nine or any other digits over nine is impossible.