Thursday, October 3, 2013

Subtracting With A Middle Zero

Today we reviewed how to subtract 3-digit and 4-digit numbers. Normally, we just borrow from the place value position to the left. However, today there was a zero and we couldn't borrow!

Here is a video showing one strategy for subtracting when the neighbor is a zero.

How did it work for you?

Did you find any problems where there were TWO zeros?
What did you do? 


  1. Thank you so much for posting such a clear and thoughtful video tutorial. Adam and I just watched it and found it very helpful. I had never heard of the squaring off technique, but it certainly makes it easier to borrow when you have more than one zero. We even tried it when subtracting from a number like 5000, and it works just as well. The only difference is that you need to put a box around the "500" and then borrow from that making it "499".
    -Adam's Dad

  2. Mrs. Yollis and class,

    I teach 3rd grade too! I loved your video on subtracting with a middle zero. I will be teaching this next week in my class. I loved your squaring off strategy. I have never seen that one before! Great job Nick on your example problem!

    Mrs. G

  3. Dear Mrs. Yollis,

    I miss you so much! I'm in 7th grade now, and I'm glad you taught me so well. Your the best 3rd grade teacher ever! I hope you and your new class enjoy the rest of the year.

    From your former student,
    Moraiya Pourfarid

    P.S. I miss Panda too! :)

    1. @ Moraiya,

      How nice to hear from you! I miss you too!

      I am happy to hear that you think I taught you very well. That makes me smile!

      I know what a dog lover you are. If you go to our 365 blog and search using the word "Buck", you will see my one-and-a-half year old dog! I love him so!

      Your proud former teacher,
      Mrs. Y♥llis

      P.S. Remember, never use your last name on the Internet. We always want to limit personal information! :-)


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