The crossword solutions for the term ADD UP TO are AMOUNT (6 letters), SPELL (5 letters), TOTAL (5 letters), NUMBER (6 letters), EQUAL (5 letters), ARE (3 letters), MAKE (4 letters), and COST (4 letters), MEAN (4 letters). This phrase is used to describe when the sum of two or more numbers, amounts, or values is EQUAL to a TOTAL. For example, if you add up the COST of three items, the TOTAL AMOUNT would add up to the sum of the individual costs. Additionally, if you SPELL out a NUMBER, such as twenty-five, the letters in the word would add up to the numerical value of 25.