Students learn to use the equal sign to show equal expressions. Next, students practice filling in one missing addend to make the equation true with direct instructions
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
D. Identify and create equal and non equal addition expressions
F. Identify whether number sentences are true and false