demonstration of how to do open array multiplication

Wednesday, January 18, 2012

Hello students and families,

Here is a quick demo of how to multiply using an open array. I’ve tried to cram 3 days of lessons into a 5 minute demo, so hopefully it makes sense!
Enjoy –

Jen M p. 1
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  1. fatuma says:


  2. hildy says:

    Thank you for posting ! My 4th grader needed help with this and I had never heard of it….

  3. julia says:

    I love this method! 🙂

  4. Kate says:

    I like the multiplication open arrays that you showed us it is a easy way to remember multiplication.

  5. Keagan says:

    At first I thought multiplication was hard.But now that I know how to do it it gets easier every time we work on it.

  6. gary de graaff says:

    I prefer a calculator – handheld, phone, computer etc..
    Or sometimes I call my mom.

    Seriously, arrays are cool to keep it simple, and conceptualize.

    Old school, alga rythims rule.

  7. Taz says:

    Makes sense to me!

  8. zaiga says:

    Open arrays are so much fun!!!

    1. anita says:

      no it ISN’T

      1. Sorry, Anita – I’m with Zaiga on this one. Did you see the latest pencast on multiplication boxes? you might like that better.

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