Archive for the ‘10 Mentalist Maths Tricks’ Category

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Trick 1: The Great MATHoudini

November 30, 2012

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The Great MATHoudini

Requirements: 1 phone book, Great showmanship

Start by handing one member of the class a sealed envelope. It contains a name that you have seen in your mathematical mind.

All will be revealed at the end of the performance.

Ask one student to write a 3-digit number on the board.

Ask a second student to turn this number around and subtract the smallest number from the largest number.

Ask a third student to turn that number around and add the last two numbers.

Example: N1 = 371.

N2 = 173

N1 – N2 = N3 = 371 – 173 = 198

N4 = 891

N4 – N3 = 891 + 198 = 1089

Give a fourth student a phone book. Ask them to go to page 108 and count down 9 places on the first column and read out the name.

Now open the envelope.

Da! Da!

 

How does it work? The numbers ALWAYS add up to 1089 so you had plenty of time to check out the name int he phone book.

Source: Magic/Menatalism Tips and Tricks

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Trick 2: Luck Be a Math Nerd Tonight

November 30, 2012

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Luck Be a Math Nerd Tonight

Requirements: 1 die, a fanfare would be nice.

You will find a fanfare here.

Ask a student to roll the die, double the number and add 5.  He can show the class the number, but not you.

Ask the student to multiply this number by 5.

Ask the student to roll the die again and add this number to the total.

Now you can tell them the numbers they rolled.

Example:

N1 = 3

Double: 2N1 = 6

Add 5: 2N1 + 5 = 11

x5:   5(2N1 + 5) = 55

Roll dice:

N2 = 4

Add 4:

55 + 4 = 59

Math Nerd:

Secretly subtracts 25 from this number:

59 – 25 = 34

Da! Da! There are the two numbers rolled.

Source: Magic/Menatalism Tips and Tricks

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Trick 3: Maths Swami Knows Your Birthday

November 30, 2012

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Maths Swami Knows Your Birthday

Requirements: Calculator and spooky demeanor

Imagine your birthday was 24 September 1973.

Written as an American date (not UK or Australia) this would be:

9-24-73.

Give the calculator to a student:

Take birthday month and add 18:

9 + 18 = 27

x 25

27 x 25 = 675

- 333

675 – 333 = 342

x 8

342 x 8 = 2736

- 554

2736 – 554 = 2182

Divide by 2

2182/2 = 1091

Add day of birthday date

1091 + 24 = 1115

x5

1115 x 5 = 5575

+ 692

5575 + 692 = 6267

x 20

6267 x 20 = 125340

Add the last two digits only of your birth year

125340 + 73 = 125413

- 32940

125413 – 32940 = 92473 = 9-24-73

Yes! Yes!

Hint: It probably would be easier to ask them for their birthday. Ha! But Maths Swami’s are mysterious beings.

You will find a video link on Youtube

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Trick 4: Madame Mathematique Clairvoyant

November 30, 2012

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Madame Mathematique Clairvoyant

Requirements: Spooky music and spooky look.

You will find some spooky music here.

Ask a student to write down two 5-digit numbers. You rapidly write a 5-digit number underneath.

Ask another student to write another 5-digit number. You write another 5-digit number quickly.

Stand back.

And instantly write the answer.

Example:

N1 = 97413

N2 = 28619

N3 = 71380  (Each digit in N3 must add up to 9 with digits above)

N4 = 64231

N5 = 35768  (Each digit in N5 must add up to 9 with digits above)

Now you will instantly write down the sum of these five numbers as

297411

Da! DA!

The trick is to subtract 2 from N1 and put it in front:

N1 = 97413

N1 -2 = 97411

Sum of 5 numbers = 297411

Hint: Get as many students to add up the five 5-digit numbers on a calculator. You will beat them, but you will also need many answers as a number of students will key incorrect numbers.

Magic Chat

 

 

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Trick 5: Maths Nerd Goes Mentalist

November 30, 2012

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Maths Nerd Goes Mentalist

Requirements: A Pack of Cards and a dorky assistant.

Take 10 cards from pack including the 10 Diamonds.

Lay out card in 3 columns in a pattern of 4 down, 2 down, 4 down.

Put the 10 Diamonds at the top of the  left hand column.

Group students around. You turn your head away and ask a stuendent to point to a card.

YOu carry on, think allowed and then ask your assistant to point to cards asking:

Is it this one?

No.

Is it this one?

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When your assistant points to the 10 Diamonds he will show you the position using the diamonds. The cards are laid out on the table in the pattern of the diamonds on the 10 Diamonds.

Whenever your assistant asks is it this one? You will know.

See Mentalism Card Trick:

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Trick 6: Freaky Math Medium

November 30, 2012

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Freaky Math Medium

Requirements: Smart Board/ Data Projector

 

Write the word carrot inside your math text book. Do not show students.

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Alternative trick:

When Mathspig was a mathspiglet we used to paly a similar trick. this doesn’t work on everyone, but it works many often enough.

Ask a student to say 15 times 15 fifteen times.

Then ask them to name a vegetable. Same Deal. Students say carrot 90% (I’m guessing) of the time.

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Trick 7: Maths Psychic Goes Psycho

November 30, 2012

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Maths Psychic Goes Psycho

Requirements: Pack of cards and a little practise.

Watch this video to learn the trick. Then try it out on the class.

Beginner Math Prediction Card Trick

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