MATH MAGIC

Making Math Magic

NUMBER TRICK #1

Think of a number. Add 3.

Multiply by 2. Add 8.

Divide by 2. Subtract your original start number.

What is your result?

Making Math Magic

7

Making Math Magic

Try it again…….

Think of a number. Add 3.

Multiply by 2. Add 8.

Divide by 2. Subtract your original start number.

What is your result?

Making Math Magic

7

Making Math Magic

Trick #2 • Pick your favorite number between 1-9 • Multiply by 3 • Add 3 • Multiply by 3 again (I’ll wait while you work it out....) • You'll get a 2 or 3 digit number…• Add the digits together

• Now find that number on the next slide to see who your role model is ...

Making Math Magic

1. Einstein 6. Gandhi

2. Nelson Mandela 7. Muhammad Ali 

3. Abraham Lincoln 8. Thomas Edison

4. Helen Keller 9.  Mrs. Hall

5. Bill Gates 10.  Oprah Winfrey

Making Math Magic

1. Einstein 6. Gandhi

2. Nelson Mandela 7. Muhammad Ali 

3. Abraham Lincoln 8. Thomas Edison

4. Helen Keller 9.  Mrs. Hall

5. Bill Gates 10.  Oprah Winfrey

Making Math Magic

BACK TO TRICK #1

Think of a number.

Making Math Magic

X

BACK TO TRICK #1 cont.

Add 3.

Making Math Magic

X 11 1

BACK TO TRICK #1 cont.

Multiply by 2.

Making Math Magic

X 11 1

X 11 1

BACK TO TRICK #1 cont.

Add 8.

Making Math Magic

X 11 1

X 11 1

1

1

1

1

1

1

1

1

BACK TO TRICK #1 cont.

Divide by 2.

Making Math Magic

X 11 1

X 11 1

1

1

1

1

1

1

1

1

BACK TO TRICK #1

Subtract your original number.

Making Math Magic

X 11 1 1 1 1 1

BACK TO TRICK #1

What is your result?

Making Math Magic

11 1 1 1 1 1

BACK TO TRICK #1

Think of a number.

Making Math Magic

X

ALGEBRAIC NOTATION: x

BACK TO TRICK #1 cont.

Add 3.

Making Math Magic

X 11 1

ALGEBRAIC NOTATION: ALGEBRAIC NOTATION:

x + 3

BACK TO TRICK #1 cont.

Multiply by 2.

Making Math Magic

X 11 1

X 11 1

ALGEBRAIC NOTATION: (x + 3)2 = 2x + 6

BACK TO TRICK #1 cont.

Add 8.

Making Math Magic

X 11 1

X 11 1

1

1

1

1

1

1

1

1

ALGEBRAIC NOTATION: 2x + 6 + 8 =2x + 14

BACK TO TRICK #1 cont.

Divide by 2.

Making Math Magic

X 11 1

X 11 1

1

1

1

1

1

1

1

1

ALGEBRAIC NOTATION: (2x + 14)½ =x + 7

BACK TO TRICK #1

Subtract your original number.

Making Math Magic

X 11 1 1 1 1 1

ALGEBRAIC NOTATION: =x + 7 - x 7

On the next slide we’ll go back to Trick #2

Your job will be to model the steps with the manipulatives and to show the algebraic notation.

Trick #2 • Pick your favorite number between 1-9 • Multiply by 3 • Add 3 • Multiply by 3 again (I’ll wait while you get the

calculator....) • You'll get a 2 or 3 digit number…• Add the digits together

• Now find that number on the next slide to see who your role model is ...

Making Math Magic