GRADE 3 - MATH / ADDITION STACKING

I discovered this addition technique through pinterest and think I will try it with my 3rd grader as an another addition strategy.  We will be adding two and three 4 digit numbers.  The only problem I foresee is if the columns aren't aligned properly.  So, I will have her practice placement of numbers with index cards and use tape to align columns if there is a problem.  Then I will have her try it on paper and see if she can transfer the method.




9-22-13
In reviewing the lesson, I think this is a good technique for the kids to learn.  My feeling is that it should be learned in 2nd grade before the traditional algorithm for addition is taught.

I first had her try it using stickies.  I used straight edges instead of tape for lines so that I didn't ruin her table...

When she demonstrated understanding, I had her try it on the white board...

My student showed good understanding.  There was some practice needed to put the digits in the right columns as I anticipated.

So, I generated on the spot, grid lines to help her.

She did an excellent job and even reviewed the skill of relating addition to subtraction at the bottom.


Written directions would have been helpful, so here they are for the next time I teach the lesson.

Directions for ADDITION STACKING:

Add the digits in the ones column.  If the answer is one digit, put it in the ones column on the first line.  If the answer is two digits, put the answer in the tens and ones column on the first line.

Add the digits in the tens column.  If answer is one digit, put it in the tens column on the second line.  If the answer is two digits, put the answer in the tens and hundreds column on the second line.

Add the digits in the hundreds column.  If the answer is one digit, put it in the hundreds column on the third line.  If the answer is two digits, put the answer in the hundreds and tens column on the third line.

Add the digits in the thousands column.  If the answer is one digit, put it in the thousands column on the fourth line.  If the answer is two digits, put the answer in the ten thousands and thousands column on the fourth line.

Add each column.