Four slides each containing four questions; the answer to each question is the same (and in the middle of the slide) but parts of the question are missing. Students need to find the missing values in the question so that they can get the answer stated. Some questions have single answers, others have multiple answers (I have tried to give algebraic answers where I can) and asking students to generalise answers could be an extension. These have proven popular in class and lead to good reasoning discussions.
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