Hello everyone, Thanks for coming back for another week of examining the next gen common core standards. We are still in second grade math and this week and we are moving past the base ten models we learned last week and start to look at addition and subtraction with in the range of 100. Here is what the standards for this week look like.

Through their learning in the Operations and Algebraic Thinking and Numbers and Operations in Base Ten domains, students:
• use their understanding of addition to develop fluency with addition and subtraction within 100;
• solve problems within 1000 by applying their understanding of models for addition and subtraction, and they develop, discuss, and use efficient, accurate, and generalizable methods to compute sums and differences of whole numbers in base-ten notation, using their understanding of place value and the properties of operations
• select and accurately apply methods that are appropriate for the context and the numbers involved to mentally calculate sums and differences for numbers with only tens or only hundreds.

The portion of this I would like to learn how to teach are how we can help students learn addition and subtraction within 100. Specifically I would like to give them a way to learn about regrouping that with greatly help with their addition. For that I found a great video that explain the process and is engaging for the students.

A lot of students might already be familiar with this method and thats great but I think it still provides great visuals to give the students a great frame work to use.

Next up I would like to show you a lesson that can be used to teach the concept of subtraction with regrouping. This video shows us more than 1 way to do this so it can enhance the students critical thinking and expand their vocabulary so they can better express their reasoning. If I was in a second grade class I would base my discussion around the content of this video. Please take a look.

With these two topic covered we can successfully guide students down the path the next gen common core standards is directing us. If you have another ways we can teach this please let me know in the comments. As always, thanks for reading!