How to Add and Multiply Quickly in your Head

4 Comments 

numbersWant a peek under the ‘hood’ of my brain when I do a mental math calculation? This video is a slow-motion, step-by-step snapshot of what goes on when I add numbers in my head. The first thing you need to learn is how to add from LEFT to RIGHT, which is opposite from most math classes out there. I’ll show you how to do this – it’s easy, and essential to working bigger numbers in your head.


Here’s what you do:


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Comments

4 Responses to “How to Add and Multiply Quickly in your Head”
  1. Laura Amon says:
    Thursday at 8:12 pm

    Thanks, Aurora.

    We figured out that I needed to use a different browser. Now I can access all of the videos referred to in the text.

    Thanks,
    Laura Amon

  2. Aurora says:
    Wednesday at 8:56 pm

    Make sure you are logged in – it’s right under the words “I’ll show you how to do this – it’s easy, and essential to working bigger numbers in your head. Here’s what you do: “

  3. Laura Amon says:
    Wednesday at 7:29 pm

    Hi Aurora,

    There was no video attached to “How to Add and Multiply Quickly in your Head.” Was the link deleted?

  4. Cortland Hill says:
    Monday at 10:09 am

    I think the 300X126 example for L to R multiplication is misleading and confusing – since it’s really 3X126, you should say this, simplify the problem and add the zeros at the end. Scientific notation would work better here.

    As worked: the 60 should be placed in the proper location under 300 – you write it as if if represents 600 not 60.

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