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It would be helpful if you told us more about the class and the demographic. Is this freshman calculus at Enormous State University? Or abstract algebra at Princeton? Kind of changes the answer based on the type of drill the peeps are doing and what their capabilities are. I recommend sharing written solution (or at least answer) keys at the sessions. ...


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For gifted students, you could do them from algebra on. Say starting at grade 9 (1age 14). In some ways, they are very similar to the sorts of applied algebra that are involved in chemistry (but still seem to challenge university students...word problems are hard!) Conceptually even earlier, you could use them, from grad 6 (11). I would just watch out, ...


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