Back to school math essential! Give your students the benefit of these attractive addition and subtraction clue / key word posters! This resource contains a full-size page of both addition and subtraction words, as well as smaller individual charts. Addition clue words include: total, join, both, increase, all together, combined, sum, plus, in all, and add. Subtraction clue words include: how many more, remain, subtract, difference, minus, left, take away, less than, decrease and 'er' words. 5 p