id: 02401881
dt: j
an: 1993a.01794
au: Ingold, J.
ti: Learning program on percentages and on calculations of interest.
    Uebungsprogramm zur Prozentrechnung und Zinsrechnung.
so: 1992. 3,5” diskette.
py: 1992
pu: 
la: DE
cc: F83 R23
ut: Percentages; Educational Software; Drill and Practice; Rule of Three;
    Proportion; Computer Programs; Software; Lower Secondary; ;
    Prozentrechnung; Unterrichtssoftware; Ueben; Dreisatz;
    Proportionalitaet; Programm; Software; Sekundarstufe 1
ci: 
li: 
ab: 
rv: