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kuldsete helmestega saab laps 9999 piires liita, lahutada, korrutada ja jagada nii üleminekuta kui ka üleminekuga
operations with the golden beads . Montessori pedagoogika terminisõnastik. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mon/operations%20with%20the%20golden%20beads/1/eng (01.08.2026)