With the new common core standards for mathematics, teachers need to understand how to use addition and subtraction word problems, situation equations, and solution equations to support students' ability to reason fluently. Learning to...think addition to subtract makes subtraction as easy as addition! The posters I have created for the Common Situations for Addition and Subtraction, will be a great addition to a Math Focus Wall. These posters can be referenced during calendar time, number of the day, number talk time and during instruction. I plan to have students write their own situation equations as well as solution equations.