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Expanded Form for Multiplication

Posted by: | November 13, 2008 | 7 Comments |

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. :)

    _____

     28

+  80

    ___

   108

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7 Comments

  1. By: sspata on November 13, 2008 at 3:22 pm      

    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. By: beck on November 14, 2008 at 3:19 pm      

    I think that the expanded form is pretty easy now.

  3. By: sspata on November 15, 2008 at 12:04 am      

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

  4. By: Kim Hardwick on November 16, 2008 at 4:40 pm      

    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.
    Thanks,
    Kim Hardwick (Emma’s Mom)

  5. By: sspata on November 16, 2008 at 9:07 pm      

    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. By: SARA on November 19, 2008 at 7:00 pm      

    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)

  7. By: sspata on November 20, 2008 at 11:24 am      

    Great job!!!

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