Tuesday 26 February 2013

Double Digit Multiplication

I am going to explain double digit multiplication in three different ways: pictures,video, and words.
Here is a how to do Double Digit Multiplication:


 Here is are some videos on multiplication, they are split into 3 different videos.
Video 1
Video 2
Video 3

Here I wrote the instructions:
  1. You multiple the bottom right number by the top right number and write your answer underneath the bottom right number--carry any tens into the top left number.
  2. You multiple the bottom right number by the top left number and add any tens from the last question into your semi-final answer.
  3. Next do the same, but instead of  multiplying with the bottom right you multiple by the bottom left number--but the answers from this question a row underneath your last answer.
  4. Final step before getting your answer, add the two numbers answer numbers together.
That may have been a little confusing to you, but to some of you that may be very helpful.
Here is a picture of double digit multiplication to help:


           Tens  Ones
     5 6
  x 4 2
------------------------------------------
  1 1 2
+2 2 4
--------------------------------------
  3 3 6

3 comments:

  1. now did you i like math fiona

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  2. Hi Fiona,

    I'm so glad you made a post about multiplication and I really want to share it with your classmates, but I can't get the videos to work. Can you check them and see if they work for you?

    Shauna

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    Replies
    1. I actually got them to work, when you press on it it downloads the video so you can watch it, then you press on that and the video should pop up, at least that is what happened when i tried them!
      See you tomorrow,

      -Fiona

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