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I use this worksheet as practice with my 7th/8th grade students when discussing radioactive decay. There are a few different methods all on the same worksheet, but I have found they like the table method best. One file contains the practice; the other file has my notes/answer key on it.

Half-Life Quiz that is fully editable. Could also be used as homework. For use with Radioactive decay/radiometric dating problems. Use accompanying worksheet for sample problems and answers.