When we used these boards today, my students told me they'd used them in second and third grades too. Numbers they had experienced looked similar to the one shown above. Today we moved into the millions (and on their request, the billions!) Later this year we'll use these same boards for decimals.
After a review of how to write numbers in words and expanded form, I had students build numbers as I called out the value of each place. Here's an example:
- nine hundreds
- three ten thousands
- five ones
- six tens
- A few children had difficulty moving the number straight down to the standard form lines. This showed me that these students were not grasping the concept of place value.
- Many children forgot to put commas after the period names or hyphens between the tens and ones places. It's typical, and I filed this knowledge away to review over and over this year.
- Some students kept the tens and ones places (in one or more periods) together when writing expanded form. I had to remind them that EVERY non-zero digit is translated to a separate number when writing expanded form.