Tuesday, February 16, 2016

Hi Friends!  Here in MA we are on VACATION!!!!  So exciiiiiiited for a little break.  I am blogging today about addition strategies, which I am a HUGE fan of.  It allows ALL my students to be successful at addition.  Yes, I said ALL!!!!!!  ***I have other posts and anchor charts that you can read ... here ...with a freebie!***

  Do you teach strategies for addition or the standard algorithm?  I am going to talk about two strategies that the majority of my class use.  I teach about five strategies, and my students are currently using two.  They can use any strategy that they want, and last year my students used different strategies tha my students this year.  So interesting the strategies that the students choose to use.  

The first strategy:  Place Value Chart

Students can draw their own chart or you can give them a paper/template to help them stay organized.  Students begin by drawing out both addends, using base ten blocks.

Students count the value in each place value column (in expanded form).  At this time, students will notice that they have too many in the ones column and need to compose or regroup to make a new ten.

How do they show composing to make a new ten?  Students circle ten ones, draw an arrow to show that they are moving ten ones to a new column, to compose a new ten.  Students can count up the hundreds, tens, and ones in expanded form below the chart. 

The Second Strategy:  Addition Split

Addition split... students start by drawing arrows and decomposing (splitting) both addends into hundreds, tens, and ones.  Then they write both numbers in expanded form.  

    Then you add the ones, tens, and hundreds vertically.  

Students will notice that they have too many ones.  They can compose a new ten.  My students slash out and rewrite below when they are regouping.  The numbers are written in expanded form, which students know to put that number together to get the answer.

These strategies can be used with regrouping in the hundreds, tens, and ones column.  Using strategies, helps students understand the process and they are able to articulate composing, decomposing, regrouping.  

I will be back soon to go over some subtraction strategies!  :)  
I hope this helps you.  Thank you for stopping by.