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2. English numerals - Wikipedia

   en.wikipedia.org/wiki/English_numerals

   Numbers with a decimal point may be read as a cardinal number, then "and", then another cardinal number followed by an indication of the significance of the second cardinal number (mainly U.S.); or as a cardinal number, followed by "point", and then by the digits of the fractional part. The indication of significance takes the form of the ...

3. List of numeral systems - Wikipedia

   en.wikipedia.org/wiki/List_of_numeral_systems

   Using all numbers and all letters except I and O; the smallest base where ⁠ 1 / 2 ⁠ terminates and all of ⁠ 1 / 2 ⁠ to ⁠ 1 / 18 ⁠ have periods of 4 or shorter. 35 Covers the ten decimal digits and all letters of the English alphabet, apart from not distinguishing 0 from O.

4. Natural number - Wikipedia

   en.wikipedia.org/wiki/Natural_number

   The first ordinal number that is not a natural number is expressed as ω; this is also the ordinal number of the set of natural numbers itself. The least ordinal of cardinality ℵ 0 (that is, the initial ordinal of ℵ 0) is ω but many well-ordered sets with cardinal number ℵ 0 have an ordinal number greater than ω.

5. The Development and Assessment of Early Cardinal-Number Concepts

   files.eric.ed.gov/fulltext/EJ1386920.pdf

   Number-recognition tasks, such as the how-many task, involve set-to-word mapping, and number-creation tasks, such as the give-n task, entail word-to-set mapping. The present study involved comparing sixty 3-year-olds’ performance on the two tasks with collections of one to three items over three time points about 3 weeks apart.

6. ORDINALITY, NEUROSCIENCE AND THE EARLY LEARNING OF NUMBER - ed

   files.eric.ed.gov/fulltext/ED599775.pdf

   chart to a group for the first time, students need to see how numbers are named on the chart. Rather than concern about the meaning or place value of numbers, the focus is on how to say and write numbers and to gain awareness of how they are ordered. The teacher might tap on a number in the units row and get the class to chant back in unison

7. Cardinal numeral - Wikipedia

   en.wikipedia.org/wiki/Cardinal_numeral

   In linguistics, and more precisely in traditional grammar, a cardinal numeral (or cardinal number word) is a part of speech used to count.Examples in English are the words one, two, three, and the compounds three hundred [and] forty-two and nine hundred [and] sixty.