Let's use PEMDAS
(13 - 10 1/3) + 2 2/3
10 1/3 can be rewritten to 31/3
13 can be written to 31/1 then multiply both the 31 and 1 to get the same denominator to be able to subtract
39/3 -31/3 is 8/3
8/3 + 2 2/3
since it is already the same denominator
we can rewrite 2 2/3 to a improper fraction
8/3 + 8/3
16/3
is written to 5 1/3
Hope this helps :)