1. Students need to learn to make groups of 10 items and then count the groups as a single unit.
2. Base-ten number knowledge results from an ability to count , to make groupings, and to understand place-value at a deeper level than simply naming places.
3. Use of concrete materials facilitates grouping and ungrouping by Tens.
4. Students should recognize that the word "Ten" can represent one unit or ten single units.
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