1. Use appropriate tools strategically. 2. Attend to precision. 3. Construct viable arguments and critique the reasoning of others. 4. Apply the properties of operations to generate equivalent expressions. 5. Understand solving an equation or inequality as a process of answering a question: which values from a specified set, if any, make the equation or inequality true? Use substitution to determine whether a given number in a specified set makes an equation or inequality true.