9690 -Number Crunchers Addition to 10
36 bone shaped 'crunchers' with addition sums to 10. A plastic slider can easily be moved to conceal the result, the first or second part of the sum or even the symbol.
36 bone shaped 'crunchers' with addition sums to 10. A plastic slider can easily be moved to conceal the result, the first or second part of the sum or even the symbol.