Monthly Archives: February 2016

A math operation table for kids

I had such a thing in Greece when I was a kid. By pulling the i-th and j-th band on a plastic board their product was being revealed. That's how I had learned the multiplication table very quickly.

I wanted to buy something like this for my little one, but I couldn't find anything similar. All math tables work now with buttons. So I decided to construct one by myself.

At first I designed it with xfig: the prototype is table and the full elements are board and leisten. Then I printed them on 300gr carton and cut them accordingly; the board:

20160130_212859and the bands:

20160130_212923which were also cut into 20 elements:

20160131_114614Then I put it all toghether:

  1. bottom carton
  2. temlate carton, where I wrote the numbers but after putting it inside
  3. horizontal bands
  4. vertical bands
  5. cover carton with 100 quadratic holes
  6. stickers (s. below)

I fixed the band sliding by attaching small white stickers on the boundary between the bands (width = 1.4mm). On the right hand side, I fixed paper pieces with paper glue on the front side and post-it glue on the back side, so that I can pull them off and change the number board inside the construction (e.g. this one is for addition, I can change the template inside for sutraction or multiplication). Here the board with all squares closed:

20160201_121539Here with all bands open:


And here some operations: