Manipulatives
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Numeral coins
For the bases 2,3,5 and 10 we have produced numeral coins that allow to represent all numbers up to 100.
Moreover, we have made an interactive website to play with numeral coins. -
The foldable half-meter
The foldable half-meter, usually sold as keychain, is very easy to manipulate (for all ages, 4 years onwards).