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Chalkboard is an indispensable teaching aid.​

User Rsrx
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1 Answer

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Answer:

The chalkboard is one of the oldest and best-known teaching aids and it is essential for all educators to master the technique of using it. Although they may be used informally for the explanation of a problem or for a quick calculation for the whole class to see what is going on, they can be put to much better use.

User Luuk Skeur
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