I have this formula. This will look to see if a value in Col B is found in Col A, and, if so, report the value in Col A:
=INDEX(A:A,MATCH(B2,A:A,0),)
Here is a data sample
1 -- 18
5 -- 9
7 -- 12
18 -- 24
3 -- 2
24 -- 5
12 -- 3
And here is the result:
18
#N/A
12
24
#N/A
5...