Concept explainers
a. Try this mathematical magic trick several times.
- Write down a secret number, which can be any whole number.
- Multiply by 5
- Add 2
- Multiply by 4
- Add 2
- Multiply by 5
- Subtract 50
- Drop the two zeros at the end
Do you recognize the result?
b. Let S stand for a secret number that you begin with in part (a) write an expression in term of S that shows the result of applying the steps in part (a) . apply properties of arithmetic to this expression to explain why the end result of the steps in part (a) is what you noticed
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