Tally (up) is a term used to describe the process of counting, adding, and summing up a set of numbers. It is often used in accounting and bookkeeping to keep track of financial records. COUNT (5 letters) is the act of determining the number of items in a set. ADD (3 letters) is the process of combining two or more numbers together. SUM (3 letters) is the result of adding two or more numbers together. AGREE (5 letters) is the process of coming to a consensus on a particular issue. Tallying up is the process of counting, adding, and summing up a set of numbers in order to reach an agreement.