Math- Multiplying Decimals UPDATE

We are working on the 5th grade standard 5.7 Numbers in Base Ten: I can add, subtract, multiply and divide decimals to the hundredths.  I can use concrete models or drawings to explain the method used.

First we related decimals to money, and how the powers of ten help us to multiply and divide decimals.

We then "played" with our old friends the base ten blocks in class building numbers like 1.93, one whole, nine tenths, three hundredths.

We also used them to model adding and subtracting of decimals. 

Then we started on multiplying them. Here is a video I recently found that was really well done.  The teacher does a great job of explaining a brilliant way to model concretely how to multiply decimals. 

Here is the link to that video.  Watch it, it might blow your mind the way it does ours! 

Using area model to multiply decimals.

Thursday, March 23: More multiplication today

Here is some work students did together as a formative assessment of their learning. 

This week will be the beginning of dividing decimals!!