History


Help on query formulation
Scrabble for counting. Productive practicing of addition and subtraction with numbers up to ten. Rechenscrabble. Produktives Ueben der Addition und Subtraktion im Zahlenraum bis 10. (German)
Sachunterr. Math. Prim.stufe. (1 Dec 1991) v. 19(12) p. 553-557. [ISSN 0170-0944]
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