If I didn't make a mistake in translating the formula, this should be the equivalent using normal cell references:
Formula:
=IFERROR(INDEX(Accounts!$C$2:$C$10,MATCH(Checks!$V2,Accounts!$A$2:$A$10,0)),"")
When in a table, don't drag the formulae down, go to the last cell in the table (lower right) and hit the TAB key. This will insert a new row into the table and bring with it the formulae from the row above it. That is the advantage of tables over ranges.
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