# Binary Fingers!

Forget about counting to 10 on your fingers ... you can count past 1,000 if you want!

## Right Hand

With just your right hand you can count to 31:

No fingers up is 0

Thumb is 1

Index finger is 2

2 and 1
makes 3

Middle finger is 4

for 5

4 and
2 makes 6

4 and 2 and 1
makes 7

Fourth finger is 8
 ... and continue the pattern: add your thumb (+1) to make 9, or add your index finger (+2) to make 10 or add thumb (+1) and index finger (+2) to make 11 etc.

In fact you are counting in Binary:

 Number Made by 1 1 up 2 2 up 3 2+1 up up 4 4 up 5 4+1 up up 6 4+2 up up 7 4+2+1 up up up 8 8 up 9 8+1 up up 10 8+2 up up 11 8+2+1 up up up 12 8+4 up up 13 8+4+1 up up up 14 8+4+2 up up up 15 8+4+2+1 up up up up 16 16 up 17 16+1 up up etc....

Here are some more examples:

 16+8+2 makes 26
 16+8+4+2 makes 30

## Why?

So you can count to bigger numbers when you don't have a pencil or paper.

You can also "remember" numbers by holding your fingers in the right way.

Or you can show someone a secret number using just your hand (or hands, see later).

Practice counting from 0 to 31 on your fingers, just like above.

Do it many times until it becomes easy.

When you can do it well, demonstrate it to your friends!

## Left Hand

Want bigger numbers? Your left hand can help:

Now we can use all 10 fingers to make numbers like these:

 32+2 makes 34
 32+16+8+4 makes 60
 512+256+32+2+1 makes 803

And lastly, what happens when all fingers are up?

 512+256+128+64+32+16+8+4+2+1 makes 1,023

So now you can count just past 1,000 using only 10 fingers. Wow.

Practice this over the next few days ... you will gain a new skill and also find binary much easier to understand.