The term 'counts up' can be solved by two crossword solutions: 'tallies' and 'adds'. Tallies is a seven letter word and adds is a four letter word. Counting up is a mathematical operation that involves adding numbers together. It is often used to keep track of a total amount or number of items. When counting up, each number is added to the previous one until the desired total is reached. For example, if you wanted to count up from 1 to 10, you would add 1 2 3 4 5 6 7 8 9 10 to get a total of 55. Adding is a simpler form of counting up, where only two numbers are added together. For example, if you wanted to add 3 4, you would get 7.