Students learn what an expression is. Then, students match expressions with the same sum, even though the order of the addends is switched
A. Solve simple addition equations and observe that changing the order of the addends doesn't change the sum
C. Make equal expressions and solve equations with the same addends in a different order
D. Identify and create equal and non equal addition expressions
E. Use the equal sign to show and create equal expressions (Part 1)
F. Use the equal sign to show and create equal expressions (Part 2)
G. Identify whether number sentences are true and false