The kids can do single and double digit additions and some multiplication.  But they get timid when the numbers get bigger.  So, Wanda knows that 13+2=15.  But she has trouble with 130+20.  So in this exercise I tried to help her realize that tens is just like ones.
And she did very well!  Even 400+400 and 4000+4000.  And, she didn't cry.  When you break things up into little chunks, everything becomes easier.

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