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2. Rounding - Wikipedia

   en.wikipedia.org/wiki/Rounding

   In the example from "Double rounding" section, rounding 9.46 to one decimal gives 9.4, which rounding to integer in turn gives 9. With binary arithmetic, this rounding is also called "round to odd" (not to be confused with "round half to odd"). For example, when rounding to 1/4 (0.01 in binary), x = 2.0 ⇒ result is 2 (10.00 in binary)

3. Significant figures - Wikipedia

   en.wikipedia.org/wiki/Significant_figures

   For an integer in rounding, replace the digits after the n digit with zeros. For example, if 1254 is rounded to 2 significant figures, then 5 and 4 are replaced to 0 so that it will be 1300. For a number with the decimal point in rounding, remove the digits after the n digit. For example, if 14.895 is rounded to 3 significant figures, then the ...

4. Round number - Wikipedia

   en.wikipedia.org/wiki/Round_number

   A round number is mathematically defined as an integer which is the product of a considerable number of comparatively small factors [12] [13] as compared to its neighboring numbers, such as 24 = 2 × 2 × 2 × 3 (4 factors, as opposed to 3 factors for 27; 2 factors for 21, 22, 25, and 26; and 1 factor for 23).

5. Decimal separator - Wikipedia

   en.wikipedia.org/wiki/Decimal_separator

   The Indian numbering system is somewhat more complex and unusual: It groups the rightmost three digits altogether (until the hundreds place) and thereafter groups by sets of two digits. For example, one trillion (on the short scale ; a million millions) would thus be written as 10,00,00,00,00,000 or 10 kharab .

6. List of mathematical constants - Wikipedia

   en.wikipedia.org/wiki/List_of_mathematical_constants

   A mathematical constant is a key number whose value is fixed by an unambiguous definition, often referred to by a symbol (e.g., an alphabet letter), or by mathematicians' names to facilitate using it across multiple mathematical problems. [1]

7. 6174 - Wikipedia

   en.wikipedia.org/wiki/6174

   The natural integer 6174 is known as Kaprekar's constant, [1] [2] [3] after the Indian mathematician D. R. Kaprekar. This number is notable for the following curious behavior: Select any four-digit number which has at least two different digits (leading zeros are allowed), Create two new four-digit numbers by arranging the original digits in a.