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This 18 question puzzle provides students with practice using the formula for simple interest ( I = prt). The first 9 questions have students solve for interest, then the second half have students solve for either principal, rate, or time.
This is a fun & interactive way for students to practice simple interest. My students would much rather complete a puzzle than a worksheet.
You may choose to enlarge the triangles for group work, reduce their size to fit on an interactive notebook page, or keep them the size they are.