Understanding the equal sign with visual representation. Introducing algebraic concept Students balance the equation by adding "fish" to the scale. Then students solve the equations. Unknown in all positions Find the missing addend or sum - simple addition equation (10 problems)Find the missing addend and solve the equations- 2 equations with the same sum, different addends (10 problems)Commutative Property of addition - 2 equations with the same sum and same addends in different order. (10 prob