The first page of this file gives students a list of commonly used reasons in algebraic proofs (e.g., addition property of equality). The second page has three practice two-column proofs and quicker practice identifying properties that change one equation into four equivalent equations.
Common Core Standard(s):
A-REI.1 Explain each step in solving a simple equation as following from the equality of numbers asserted at the previous step, starting from the assumption that the original equation has a solution. Construct a viable argument to justify a solution method.
An answer key (for notes and for practice) is included.