Tuesday, October 4, 2016

Subtracting from Teen Numbers

When you are getting ready to begin Goal 8 Subtraction, you may be wondering how you can help your students move beyond counting back or counting up to solve these problems using strategies based on properties of operations. I've made a Subtracting from Teen Numbers screencast that shares four different strategies that do just this. The screencast also includes a number talk approach that will provide students with time and tools to generate some or many of these strategies using logic and visuals. These four strategies will also be very relevant to Goal 9 subtraction.

You may also find you want to try this approach with Goal 5 subtraction. Relating subtraction to addition and Take from Ten may be particularly helpful for Goal 5.

I hope you and your students enjoy!




1 comment:

Jason Greenwood said...

In the last example you have -9 + 1 = -10 when it should be -9 - 1 = -10