Stop Motion Meets Addition Strategies....Learning With Pixstop

We've been crunching lots of numbers in math lately.  For the past month, we've been working on proficiency in adding two digit numbers.  Not only have we explored numerous ways that two 2-digit numbers can be added, but we've experimented with different ways that we hadn't thought of initially.  For an extension project, partner groups created a math problem that would involve regrouping.  So, they needed to think ahead - the ones would need to add up to a sum greater than 9.  Next, they chose a way to add.  There are so many options......  Here is what the partner groups chose.  They used the pixstop app to take photos and create a stop motion video of the various steps taken to solve the equation.  Next, they had to choose how many frames would appear per second for the final video, in other words the speed of the photos.  For the first video, we were experimenting with the new app.  What's your favorite way to add numbers?  Please share your strategy of choice with us!