The crossword solution for the term 'CHECK THE SUM OF' is 'READD', which is an acronym for 'Reconcile, Examine, Adjust, Document, and Disclose'. This is a process used in accounting to ensure that the financial records of a company are accurate and up-to-date. It involves reconciling the accounts, examining the documents, adjusting any discrepancies, documenting the changes, and disclosing the results.