Here is a worksheet on the Greek word root iso-. It means equal and same. It’s at the root of a number of frequently used words in mathematics and the sciences; the two words I recognize from the list on this document (which were chosen, as the book from which they were drawn emphasizes, because of the frequency with which they appear on college admissions tests like the SAT) are isosceles and isotope.
Otherwise, as you will quickly perceive, the words on this worksheet are not high-frequency words in everyday discourse.
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Mark's Text Terminal 