Dealing with Decimal Models

Students will be learning how to model decimals using the grids.  Decimals will range from under 1 to greater than one.  Using the decimal grid helps students visualize what the decimal looks like and sounds like.  This first section has them shading in the appropriate decimal and then reading the grid to write the appropriate decimal.  For each problem, I’m going to use a think-pair-share to help them get started on the modeling. (SMP 1, 3,4 and 6)

Tools:  Modeling decimals power point and notes, extra 10 x 10 grid paper

I like using the base 10 blocks because the students can actually manipulate the tools (SMP 5).  I will be giving them examples that are less than one and greater than one.  I will be using the think-pair-share model here too.  It’s important for students to know they are on the right track. (SMP 3)

Before moving on to the next section, ask the students these two questions to check for understanding.

1. Three-tenths is equivalent to how many hundredths.  You may have to address the word equivalent so that all students know what it means.
2. How many tenths are the same as ninety hundredths?

I will have the students using the white boards so that I can quickly assess who is getting it and who is not. 

Students have a difficult time making the connection between equivalent decimals.  Have students model what they know and then match the model by using a second set of manipulatives.  For example, if they put down 3 sticks (tenths), ask them what other model from the base 10 blocks could they use to make an equivalent decimal?  The only tool available would be the hundredths.  Ask, "how many hundredths will be needed to make it equal.?"

Tools:  Modeling decimals power point and notes, base 10 blocks

Money is the easiest decimal to model because it is an everyday thing.  Students will be given pictures of the money and have to write the decimal or they will be given the decimal and they have to make it into money.  The students will benefit from a think-pair-share because when they have to create the money, students may model it in different ways which will lend itself to some good discussion (SMP 3)

Tools:  Modeling decimals power point and notes, play money