## Trick 3: Maths Swami Knows Your Age and Foot Size

July 9, 2018## That Crazy Little Thing Called ZERO

July 4, 2018## Trick 4: How to be a Mathematical Clairvoyant

June 22, 2018# How to be a Mathematical Clairvoyant

### Requirements: Spooky music and spooky look.

### You will find some spooky music here.

**Tell your students you will beat them adding up 5 x 5 digit numbers in your head when they are using calculators.**

# Method:

### 1. Ask a student to write down 2 x 5-digit numbers on the board.

### 2. You rapidly write a 5-digit number underneath.

### 3. Ask another student to write another 5-digit number.

### 4. You write another 5-digit number quickly.

### 5. You have 5 by 5 digit numbers. Say ‘Go’. You instantly write down the answer.

### Stand back.

# This is how it works:

### N_{1 }= 97413

### N_{2} = 28619

### N_{3} = 71380 (Each digit in N_{3} that you write down must add up to 9 with digits in No. above)

### N_{4} = 64231

### N_{5} = 35768 (Once again 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

# This is why it works:

### Hint: When you get your students to add up the five 5-digit numbers on a calculator you will beat them, but they will also get many different answers as a number of students will key incorrect numbers.

# Magic Chat

## Climbing a Stairway to 7, or maybe, 77?

June 14, 2018**They take their maths seriously in Germany. They have monuments to mathematicians. They name streets after mathematicians. They take maths into shopping malls.**

**They think maths is so important they even put maths on stairs. Here is some times tables art from Germany.**

## Learning Jump Strategy from a Young Mathematician

June 8, 2018**Mathpig just learnt this from a young Mathematician age 9.**

**It is a great way to do maths because you are thinking ‘Mmmm! How can I work these numbers.’ **

**Getting maths students to think about what they are doing is so much better than just having them guess ‘ Arrrr! Whatever. Click B.’**

**More jump strategy information here.**

**This will be very useful later when it comes to a similar method used to simplify long division:**

## Trick 5: Cool Math Trick

June 4, 2018### Requirements: A Pack of Cards and a willing 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 student 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?

### No.…………………………………………………………………………………

### 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: