## Archive for the ‘10 Mentalist Maths Tricks’ Category

## Trick 1: The Great MATHoudini

November 30, 2012## Trick 2: Luck Be a Math Nerd Tonight

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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:

### N_{1} = 3

### Double: 2N_{1 }= 6

### Add 5: 2N_{1} + 5 = 11

### x5: 5(2N_{1} + 5) = 55

### Roll dice:

### N_{2} = 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

## Trick 3: Maths Swami Knows Your Birthday

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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

## Trick 4: Madame Mathematique Clairvoyant

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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:

### N_{1 }= 97413

### N_{2} = 28619

### N_{3} = 71380 (Each digit in N_{3} must add up to 9 with digits above)

### N_{4} = 64231

### N_{5} = 35768 (Each digit in N_{5} 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 N_{1 }and put it in front:

### N_{1 }= 97413

### N_{1 }-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

## Trick 5: Maths Nerd Goes Mentalist

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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:

## Trick 6: Freaky Math Medium

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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.

## Trick 7: Maths Psychic Goes Psycho

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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