New or Recently Introduced Terms 
  Algorithm (a step-by-step procedure to solve a particular type of problem) 

      Compose (e.g., to make 1 larger unit from 10 smaller units)

  Decompose (e.g., to break 1 larger unit into 10 smaller units)

  Equation (two expressions with an equal sign between them; that is,

            an equation is a statement that two expressions are equal; however, there is no guarantee that the statement is true)

 New groups below (show newly composed units on the line below the appropriate place in the addition algorithm)            

      Simplifying strategy (e.g., to solve 299 + 6, think  299 + 1 + 5 = 300 + 5 = 305)

 Totals below