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Count backward by ones

Counting backward by ones means identifying each whole number’s predecessor in a sequence, decreasing the quantity by exactly 1 while maintaining the order of whole numbers, including transitions such as 40 to 39 and 300 to 299. A number line and place-value structure clarify these changes; the sequence is considered within whole numbers from 0 through 1,000, without extending to negative numbers or more generalized integer counting.

Detailed Explanation: Count backward by ones

To count backward by ones, say the number that comes just before the given number. Each number is exactly 11 less than the number before it.

Example: Count backward by ones from 302302 for four steps.

  1. Start at 302302.
  2. Take away 11:
    302−1=301302 - 1 = 301
  3. Take away 11 again:
    301−1=300301 - 1 = 300
  4. Take away 11 again:
    300−1=299300 - 1 = 299
  5. Take away 11 one more time:
    299−1=298299 - 1 = 298

So the sequence is:

302, 301, 300, 299, 298302,\ 301,\ 300,\ 299,\ 298

Notice that when counting backward from 300300, the hundreds place stays the same, and the number becomes 299299. On a number line, move one space to the left each time.

Learn by doing: Count backward by ones

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    Count Backwards by 1s - Within 1000

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