Wednesday, September 22, 2010

Subtracting with Regrouping Website (and much more)

I watched Ms. Martin use this site with her 3rd graders at John Thomas Elementary. After creating the problem, simply start with the ones column and drag the blue base-ten blocks down to the red blocks and watch them disappear. If you have to 'borrow,' drag the blue base-ten block over and watch it split into smaller pieces before dragging them down to the red blocks. The answer appears to the right of the page. ( I know this explanation isn't written in the best mathematical terms, but I hope it makes sense. :) )

Website Link:

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