# HEX numbers

Hopefully you have 10 fingers!  Our number system is based on this.  Zero is a number! Each finger and thumb gets a value. We count like this:

 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

Hide your thumbs.  If we had eight fingers then the number system would be like this:  Note there is no 8 or 9.

 0 1 2 3 4 5 6 7 10 11 12 13 14 15 16 17 20 21 22 23 24 25

If we had sixteen fingers then we all would count like this:

 0 1 2 3 4 5 6 7 8 9 A B C D E F 10 11 12 13 14 15

Hex numbers 0 through F translate to 0 through 15 decimal.

0h=0d, 1h=1d,.........9h=9d, Ah=10d, Bh=11d,...Fh=15d

Hex numbers 10 is 16 decimal.  (number2 X 16) + ( number1)=decimal

10h=16d, 11h=17d......20h=32d, 21h=33d, 30h=48d, 31h=49d

Hex numbers 100 is 256 decimal.  (number3 X 256) + (number2 X 16) + ( number1)=decimal

To see this work go to Windows Calculator.  START/PROGRAMS/ACCESSORIES/CALCULATOR

This is a simple calculator.  Mouse button down on VIEW, move to SCIENTIFIC, mouse button up.  Now you should see a much larger calculator.  There are buttons Hex, Dec, Oct and Bin.  Lets try a number.  With DEC on, enter 123.  Push HEX and see 7B, Push OCT and get 173 and then BIN and get 1111011.