This courseware focuses on teaching 20 - within counting on. First, it highlights that counting on can start from any number, with methods like voice - varied counting on to 20 after listening to numbers and group exercises. Then, it uses bead strings to help, along with exercises on judging counting - on correctness and counting to a specified number. Finally, it shows counting various things, and strengthens the skill with exercises like sound - based counting and a two - player clapping game.

Main Content:
1.Section on Reciting Numbers Forward and Backward within 20
2.Section on the Correspondence between Numbers and the Quantity of Objects

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