_:n808f3e8528f44dbd82d09a9ec3aba4fcxb22
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"Make your own magic number trick. Using this idea, you can make up your own mental math trick right on the spot. Just don't do anything too obvious, such as telling people to add 5, subtract their original number, and say \"the number you are thinking of is 5\"."
<https://www.wikihow.com/Do-a-Cool-Mathematical-Mind-Reading-Trick>