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Count objects to 100

Counting establishes a one-to-one correspondence between objects and the spoken number sequence through 100, so the last number said names the collection’s total regardless of the objects’ arrangement, size, or spacing. The understanding includes connecting counted quantities with their written numerals and recognizing that each successive count increases the quantity by one, providing a foundation for place value and later addition; it does not extend to counting beyond 100 or more advanced number systems.

Detailed Explanation: Count objects to 100

To count a group of objects, touch each object one time and say the numbers in order. The last number you say tells how many objects there are altogether.

Example: Count the dots.

● ● ● ● ● ● ● ● ● ●
● ● ● ● ● ● ● ● ● ●
● ● ● ●

  1. Start at the top left.
  2. Touch each dot once as you count: 1,2,3,,241, 2, 3, \ldots, 24
  3. The last number you said was 2424.
  4. So, there are 24 dots. Write the number as 24\boxed{24}.

It does not matter that the dots are in rows. If the objects are spread out or close together, count each one once and use the last number to tell the total.

Learn by doing: Count objects to 100

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Ten Groups - Count, Less than 20


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