Monday, June 25, 2012

Upon a Parent Request: Everday Math's Approach to teaching Addition with 2-digit Numbers

The other day, I received a phone call from a parent, whose trying to continue the progress made in the classroom.

The way I learned two digit numbers:

I do best with using an example to explain: 

   28
+14
____

Step 1: Add from the one's column 8 plus 4. This equals 12.  .
Step 2:  Looking at the answer for step 1 we have to regroup.  Looking at 12, you need to regroup the number in the 10's place. Which would be "1".
Step 3: Add the 2, the 1, and the 1 to get 4.
Your answer would be 42.

Every Day Math Approach

I will teach it as I show my students. I found it works well.

   2   8
+1    4
_____

Step 1: I always have the students draw imaginary lines to separate the one's and the 10's.  It keeps the students focused.
Step 2: The students are responsible for writing 10's over the 10's column and 1's over the 1's column.
Step 3: Look at the ten's column. You will write a "0" next to the 2 and next to the 1
Step 4: Now add the 10's column first.  20 +10= 30
Step 5: Now add the 8 and 4= 12
Step 6: Add 30 and 12 to get 42.

There are more steps, but the organization keeps the student focused and organized.  You can eliminate the first two steps, however, they may help your child.

My students can use whatever approach helps them get the answer. Whatever technique they use, they have to demonstrate an understanding of the process of solving the problem.

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