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Adding Numbers Within 100 With Regrouping

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Let's just dive right in and do one!


Just like before, stack and line things up:


<< Now, I'm going to make my stripes taller...

You'll see why in a second!

First, add the ones:

28+39  work shown for adding the ones

This is called "regrouping" since we had to put the tens guy in the next stripe over with all the other tens guys!  Way back when I learned this stuff, it was called "carrying."  Of course, we didn't have cell phones or DVD players back then either!

Now, add the tens...



So, 28+39=67