This lesson is a discussion of the differences between Join, Result Unknown problems and Part Part Whole, Whole Unknown problems. In the Common Core Math Standards, Join problems are called Add To problems, so a Join, Result Unknown problem can also be called an Add To, Result Unknown problem. Part Part Whole problems are called Put Together/Take Apart problems in the Common Core. Part Part Whole, Whole Unknown problems correspond to the Put Together/Take Apart, Total Unknown problem type.

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