1/3 of 2/3 is 2/9.
In between 1/3 and 2/3 is 1/2.
1
2/3
-1 third
2 and a third.
3 and 1 third
3
1/3 + 1/3 = 2/3
5 and 1 third divided by 2 and 2 fifths = 22/9
2 and 1 third divided by 1 half equals = 42/3
The third number is 2 -- the first number is 1, second is 1, next is 1+1=2, then 1+2=3, 2+5=5 etc.
1 1/3 + 1 1/3 = 2 2/3