The previous lesson introduced students to different ways of thinking about a decimal number, including by place value. The goal of this lesson is for students to make connections between familiar representations of decimals, such as grids or numerical form, and expanded form. Students have seen the expanded form of whole numbers in a previous course. They will apply the same idea here to write expressions showing how many of each decimal place value is in a number. This prepares students to consider the relationship between place values in a future unit. 

What unfinished learning or misunderstandings do your students have about the relationship between place values? How did you leverage those misconceptions in a positive way to further the understanding of the class?