From the website:
"The Radosza's Counting Rings is an ideal tool to practice basic mathematical calculations and to improve spatial recognition. It is also a great logic game. It is suitable for ages between 6 and 10.
Functions: Improves the mathematical skills of children in elementary school; improves thinking processes, spatial recognition, combinatory skills and dexterity. The Radosza's Counting Rings can be used at home or at school, daily or on a course. It helps with homework, in class, or can be a focus of class or school tournaments.
For example: Assemble 7 x 8 = ? Solution: green sliding unit, 7, x, 8, =, 5, 6, red sliding unit."
- diameters: large circle 11.5cm, small circle 10cm
- pieces 1.5x1.5cm
1..9 3 pieces each = 27
0 4 pieces 4
+ - 2 pieces each 4
* : < > = . 1 each 6
separators green, red, white: 1 each 3
The rails of the two rings hold 24, resp 21 pieces (sharing one piece)
External LinksRadosza's Rings Homepagehttp://www.radoszarings.com