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harjutuse eri etappides kasutatakse helmekolmnurka ning loendamistahvlit A
arvud 11–19 . Montessori pedagoogika terminisõnastik. Estonian Language Institute, Sõnaveeb 2026. https://sonaveeb.ee/search/unif//mon/arvud%2011%E2%80%9319/1/est (17.07.2026)
