Ten Frame Addition and Subtraction

Last school year I used my pattern block "triangles" for shark teeth to go along with one of Heidi Butkus' math projects. My kids loved it . So I figured why not use the "square" pieces with a ten frame mat to practice and visualize addition and subtraction problems. I'm going to make a class set on cardstock and laminate them. Here's what I came up with.It's simple but I think it will be useful! 

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