Without letting me know, choose a number and then indicate the card or cards that it appears on.
I'll tell you the number you're thinking of!
Simply look at the top left corner of the cards and add the numbers (4 + 1), for instance, if someone chooses the number 5 and points to the two cards it appears on.
Any math lesson can benefit from the energy and amazement that math magic tricks bring to the subject. You can present them to kids as problem-solving exercises and give them the task of demystifying them so they become useful exercises for fostering critical thinking abilities. THOANs are perhaps the easiest to start with (Think Of A Number).
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