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2. Casting out nines - Wikipedia

   en.wikipedia.org/wiki/Casting_out_nines

   Casting out nines. Casting out nines is any of three arithmetical procedures: [1] Adding the decimal digits of a positive whole number, while optionally ignoring any 9s or digits which sum to 9 or a multiple of 9. The result of this procedure is a number which is smaller than the original whenever the original has more than one digit, leaves ...

3. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   Multiplication table. In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for ...

4. Template:9 - Wikipedia

   en.wikipedia.org/wiki/Template:9

   Template documentation. Templates { { 1 }}, { { 2 }}, { { 3 }}, etc. warn readers/editors that a typo exists in the page they are reading/editing. If {{9}} is called, you probably meant the parameter 9 (as { { {9}}} with triple braces), but in fact only double braces were used, invoking { {9}}. In addition to a warning, it also adds pages to ...

5. Vedic square - Wikipedia

   en.wikipedia.org/wiki/Vedic_square

   Vedic square. In Indian mathematics, a Vedic square is a variation on a typical 9 × 9 multiplication table where the entry in each cell is the digital root of the product of the column and row headings i.e. the remainder when the product of the row and column headings is divided by 9 (with remainder 0 represented by 9).

6. Flying Machines Which Do Not Fly - Wikipedia

   en.wikipedia.org/wiki/Flying_Machines_Which_Do...

   Flying Machines Which Do Not Fly. " Flying Machines Which Do Not Fly " is an editorial published in the New York Times on October 9, 1903. The article incorrectly predicted it would take one to ten million years for humanity to develop an operating flying machine. [1] It was written in response to Samuel Langley 's failed airplane experiment ...

7. 1 - Wikipedia

   en.wikipedia.org/wiki/1

   1 (one, unit, unity) is a number, numeral, and glyph. 1 is the first and smallest positive integer of the infinite sequence of natural numbers.This fundamental property has led to its unique uses in other fields, ranging from science to sports, where it commonly denotes the first, leading, or top thing in a group. 1 is the unit of counting or measurement, a determiner for singular nouns, and a ...