Abzählbarkeit der natürlichen, ganzen und rationalen Zahlen

Unterrichtsmaterial<img src="/dropdown-open-small.svg" alt="Open/Close Dropdown" width="16" height="10" class="header_NavigationMenuTriggerChevron__V3YwZ"/>

Fortbildungen<img src="/dropdown-open-small.svg" alt="Open/Close Dropdown" width="16" height="10" class="header_NavigationMenuTriggerChevron__V3YwZ"/>

Pakete<img src="/dropdown-open-small.svg" alt="Open/Close Dropdown" width="16" height="10" class="header_NavigationMenuTriggerChevron__V3YwZ"/>

Inspiration &amp; Hilfe<img src="/dropdown-open-small.svg" alt="Open/Close Dropdown" width="16" height="10" class="header_NavigationMenuTriggerChevron__V3YwZ"/>