Mrs. Spata’s Fourth Grade Blog

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Expanded Form for Multiplication

on November 13, 2008

This is another “tool” for our toolbelt. Everyone MUST try this strategy!!

There are three steps to using expanded form. The first is to multiply the bottom factor to the ones of the top factor. The second step is to multiply the bottom factor to the tens of the top factor. The third step is to add the two products to each other. 

For example:

      27                                         ** Go to the math EnVision website to watch a tutorial

     x 4                                             if you need more detail about this. :)



+  80



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7 Responses to “Expanded Form for Multiplication”

  1. sspata says:

    Another example 34×2=

    step one: what is 4×2=
    step two: what does 30×2=
    **remember that the 3 is in the tens place so
    it really is a 30.
    step three: add the two products 8+60=

    Hope that helps. :o)

  2. beck says:

    I think that the expanded form is pretty easy now.

  3. sspata says:

    Becky – I am glad that you like the strategy now. It just took a little practice… Great work!!!

  4. Kim Hardwick says:

    I put a comment on the blog late Friday night. Did you happen to see it, Mrs. Spata? It related to the report the students are working on.
    Kim Hardwick (Emma’s Mom)

  5. sspata says:

    Ms. Hardwick-
    I wrote you back on Saturday. Check under “Native American Day”. Sorry that you didn’t see it. Let me know if you need any more information about it. :)

  6. SARA says:

    Hi Mrs. Spata=] first I had truoble with the expanded form. know I have been doinig some word problems and finaly got it =] =]!!!!!!!!!!!!!!!! Oh my head said thank you and you rock see you on thrusday :o)

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