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Count by hundreds

Counting by hundreds means recognizing that each successive whole number is 100 greater, so sequences such as 0, 100, 200, …, 1,000 can be understood as repeated addition of 100 and as changes in the hundreds place within the base-ten system. A number line and place-value representation show the equal 100-unit intervals and support comparison, addition, and later multiplication; the focus is on whole numbers through 1,000, not larger-number generalizations, decimals, or negative numbers.

Detailed Explanation: Count by hundreds

Counting by hundreds means adding 100100 each time. Each jump is the same size.

For example, count by hundreds from 200200 to 800800:

  1. Start at 200200.
  2. Add 100100:
    200+100=300200+100=300
  3. Add 100100 again:
    300+100=400300+100=400
  4. Keep adding 100100:
200, 300, 400, 500, 600, 700, 800200,\ 300,\ 400,\ 500,\ 600,\ 700,\ 800

On a number line, each jump from one number to the next is 100100 units. The hundreds digit increases by 11 each time:

  • 200200 has 22 hundreds.
  • 300300 has 33 hundreds.
  • 400400 has 44 hundreds.

So, counting by hundreds from 200200 to 800800 gives:

200, 300, 400, 500, 600, 700, 800200,\ 300,\ 400,\ 500,\ 600,\ 700,\ 800

Learn by doing: Count by hundreds

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    Count Backwards by 100s - Within 1000

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