This document provides an overview of addition and subtraction. It defines addition as finding the total or sum of combining two or more numbers, and subtraction as taking one number away from another. Key words are identified to determine whether a word problem involves addition or subtraction. Examples are given of setting up and solving addition and subtraction problems by drawing pictures, identifying key words, writing number sentences, and calculating the answer. The layout involves finding the key word, drawing a picture, writing the number sentence, and solving.