Students solve equations with the same sum but different addends. Then, students solve equations to see if they are equal or not. Students practice algebraic thinking by filling in a missing addend that will make two expressions equal
A. Solve simple addition equations and observe that changing the order of the addends doesn't change the sum
B. Explore expressions and reinforce the commutative property of addition
C. Make equal expressions and solve equations with the same addends in a different order
E. Use the equal sign to show and create equal expressions
F. Identify whether number sentences are true and false