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2. Verbal arithmetic - Wikipedia

   en.wikipedia.org/wiki/Verbal_arithmetic

   Verbal arithmetic, also known as alphametics, cryptarithmetic, cryptarithm or word addition, is a type of mathematical game consisting of a mathematical equation among unknown numbers, whose digits are represented by letters of the alphabet. The goal is to identify the value of each letter.

3. Table of mathematical symbols by introduction date - Wikipedia

   en.wikipedia.org/wiki/Table_of_mathematical...

   1698 (perhaps deriving from a much earlier use of middle dot to separate juxtaposed numbers) division slash (a.k.a. solidus ) 1718 (deriving from horizontal fraction bar, invented by Abu Bakr al-Hassar in the 12th century)

4. Category:Unknown-importance Numbers articles - Wikipedia

   en.wikipedia.org/wiki/Category:Unknown...

   Pages in category "Unknown-importance Numbers articles" The following 200 pages are in this category, out of approximately 639 total. This list may not reflect recent changes .

5. Unusual number - Wikipedia

   en.wikipedia.org/wiki/Unusual_number

   In number theory, an unusual number is a natural number n whose largest prime factor is strictly greater than . A k - smooth number has all its prime factors less than or equal to k , therefore, an unusual number is non- n {\displaystyle {\sqrt {n}}} -smooth.

6. This is why you should never call back an unknown number - AOL

   www.aol.com/article/lifestyle/2019/05/03/this-is...

   The post This Is Why You Should Never Call Back an Unknown Number appeared first on Reader's Digest. Not everything is a scam: Show comments. Advertisement. Advertisement. Holiday Shopping Guides.

7. Counting - Wikipedia

   en.wikipedia.org/wiki/Counting

   Number blocks, which can be used for counting. Counting is the process of determining the number of elements of a finite set of objects; that is, determining the size of a set. . The traditional way of counting consists of continually increasing a (mental or spoken) counter by a unit for every element of the set, in some order, while marking (or displacing) those elements to avoid visiting the ...