I have Two columns A & B on one sheet and two on another sheet C & D

If colum A = a number say 16 I would like it to find that number in Column C
and put the number parallell to it in D in coulmn B.

results would look like:
A B C D
16 70 {placed here} [finds] 16 70

I do not know if any of thid makes sense but it would save me time if i
could get thsi done. It would save looking up results in a table.
Thank you