Partial Sums Addition

In math there are several algorithms (Step-by-step methods) to calculate the answer to an addition problem.  Here's the partial sums addition method:

Also check out the EverydayMath website for terrific and helpful videos!

Go to www.everydaymathonline.com/

Click "free resources"

Select "Algorithms in Everyday Mathematics"

Fourth grade

addition

partial-sums addition

Then select an animation!