When dealing with a function, you start with one input number and then you perform at least one operation on it, based on the rule of the function, and you get a resulting output number. In this interactive, you will look at both the input numbers and the corresponding output numbers organized in the Before/After chart to find the rule of the function. First select the operation ( +, ─, x , / ) and then select the number. When you know the rule of the function, you will then be able to predict the output for any other number you choose as an input.

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