yes/no response on card, I usually have one student who's able to figure it out. Because they've had time to create a chart that shows secret number vs. Once they've generated many wrong ideas, I give them the hint that the secret has something to do with the top lefthand corner number on each card. This usually leads them to come up with lots of interesting ideas about how it works, though rarely is it the correct one. I don't give any "hints" at this time.Īfter some time, I direct students to create a chart that shows the expected yes/no card responses to each possible secret number starting with 1. I give each group a set of their own cards and let them struggle within their groups to re-create what I already showed them. Here's how I generally scaffold the activity, in case you're curious:
#Magic trick with number how to#
Plus, I find that students really get into it because they truly want to learn how to do it themselves. I love using this trick to get students thinking it makes quite a challenging small group discovery activity. There's the old saying that "magicians never tell." I'm more of the believer that magicians never tell without making their students struggle first. Getting students to figure out how it works: How cool and simple is that trick? You can repeat it with your students again and again, but I guarantee that they will quickly want to learn how to do it themselves. The sum that you just calculated is the student's secret number! Now's the fun part - blow the student away by sharing what his/her secret number is! It's much easier to remember a running total than to remember a bunch of different numbers.Ĩ. TIP: Keep a running total in your head as you move through the cards instead of waiting until the end to add them. You should have kept a mental note of the top lefthand corner numbers for all of the cards to which the student responded "yes." Add those numbers together.
Repeat until you have asked the student for all 5 number cards.ħ. Show the student the next number card in the pile and do the same as you did before.Ħ. If the student says "yes," make a mental note of the number in the top lefthand corner of that card (it's either 1, 2, 4, 8, or 16).ĥ. Show the student the first number card in the pile and ask, "Is your number on this card?" Be sure that the student looks carefully before responding. Be sure that the student does not tell you what it is.Ĥ. Show your student the "Pick a Number Between 1 and 30" card and ask him/her to pick a number between 1 and 30. The order of the other 5 number cards does not matter.ģ. Place all 6 cards face-up in a pile and put the "Pick a Number Between 1 and 30" card on top. Print out the Magic Math cards page and cut out each of the cards individually.Ģ.
#Magic trick with number pdf#
Click here to download a free PDF of the Magic Math cards. And believe it or not, you almost always, I would say 95-98 percent, it would equal 1089.1. 198, you tell them, you know what, let's randomize it a little bit more, which you have to do for the trick to actually work, you're going to reverse the new number, 198, which is 891, and this you're going to add, so first subtract, then you're going to add the two numbers together. And you're going to put the larger number on top of the smaller one and you're going to subtract that number so it's best to have somebody ready with a calculator. What you're going to do then is basically you're going to reverse the number that they just named, which is 321.
And you're going tell them you're going to randomize the number. It can be any three digit number like I said, three different numbers. You can tell them that zero's a no good, not a real number, and don't repeat the numbers, so let's just try, like 123. Isn't that great?īasically what you're going to do is have your spectator name any three digit number. Before this uh, trick started, I wrote (?) on the back from last night, it happens to be 1089.
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