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Welcome to my math blog! The purpose of this blog is to help you stay informed about our learning and experiences that have taken place during our math class. I have also included links your child (and you) may want to use in order to supplement math learning in 5th grade.

Wednesday, September 10, 2014

Estimating Division Problems

We began our journey with LONG division today.  We will be dividing 4-digit dividends by 2-digit divisors.  We started by creating a division word web that showcases prior knowledge of division (I was trying to prove that they have worked with this before!):

This took a majority of the class time, so we were just able to begin working with estimating with division.   I focused on using compatible numbers:

For example, if our problem was 2786 divided by 49.  We would round 49 to 50.  Next we would round 27 to a multiple of 5 that is close to 27.  The students chose 30.  So our problem becomes 3000 divided by 50.  Our estimation is 60 (see the second problem below).

What I like about estimating with compatible numbers is that the estimation gives us a reasonable idea of the answer to the actual problem.  So as we worked together to solve the problem (this is the first day, after all).  We used our estimation as a guide to the division.  By the end of class, nerves were calming down!

We will be working with this topic again tomorrow!!!

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