Counting forward by ones means generating the successive whole numbers from a given starting number, with each number representing a quantity exactly one greater than the preceding number. The sequence remains ordered across place-value transitions such as 9 to 10, 99 to 100, and 999 to 1,000, and can be represented on a number line or with numerals; this understanding supports adding one and place-value reasoning, but does not extend to negative, fractional, or arbitrarily large numbers.
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