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Student activities with percentages Pts. 1/2. (Rechenkartei. Prozentrechnen I/II.) (German)
Agentur Dieck, Heinsberg. (1994).
Classification: F80
1
Student activities with percentages. Pts. 3/4. (Rechenkartei. Prozentrechnen III/IV.) (German)
Agentur Dieck, Heinsberg. (1994).
Classification: F80
2
Using computers in mental arithmetic. Computereinsatz beim Kopfrechen-Training. (German)
Math. Unterrichtsprax. (1989) v. 10(3) p. 21-25.
Classification: F32
3
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