All-in-One Binary/Base-Two Model

####Binary/Base-Two Models, All in One

The present design is an all-in-one model for learning about binary numbers (or base-two numerals, strictly speaking). You can call it a base-two abacus if you like. It is easier to use and clean up in a classroom setting. The basic model allows the representations of base-ten numbers 0-31; with the extension, one can go all the way up to 1023.

####Script if You Need One

1. Work in groups of two, say, A and B. B has the model, to begin with. Turn all the pieces on the model so that they all show 0.
2. A to B: Think of a base-ten number between 0 and 31, but do not tell me. Let N be that number. Alternatively, if you like birthdays, if you can let N be the day of your birthday.
3. A to B: Are you ready? If B says yes, move on.
4. A to B: Is N greater than or equal to 16? If yes, subtract 16 from N, turn the 16-piece to 1 on the model, and **keep the leftover still in N**. If no, leave the 16-piece as 0, move on.