This powerpoint file can assist you in teaching students to write out deductive proofs in algebra.
The Do Now is made up to 2 parts. In part 1students think about some standards algebraic properties such as the distributive property, the addition/subtraction property of equality, and the multiplication/division property of equality. The slides are animated to present the steps in thinking through a proof.
In part two they think about the transitive property, the symmetric property, and the reflexive property. Similarly, they move the term next to the example.
In the next five pages an algebraic or geometric based question is posed and students write statements and pick out the reasons from a list at the bottom of the page. The statements and reasons are animated.