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2. 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 ...

3. 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).

4. Addition - Wikipedia

   en.wikipedia.org/wiki/Addition

   Making ten: An advanced strategy uses 10 as an intermediate for sums involving 8 or 9; for example, 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14. [36] As students grow older, they commit more facts to memory, and learn to derive other facts rapidly and fluently. Many students never commit all the facts to memory, but can still find any basic fact quickly. [33]

5. List of numeral systems - Wikipedia

   en.wikipedia.org/wiki/List_of_numeral_systems

   3. Ternary, trinary [28] Cantor set (all points in [0,1] that can be represented in ternary with no 1s); counting Tasbih in Islam; hand - foot - yard and teaspoon-tablespoon-shot measurement systems; most economical integer base. 4.

6. Magic square - Wikipedia

   en.wikipedia.org/wiki/Magic_square

   The oldest version of this text dates from 100 CE, but the passage on planets could not have been written earlier than 400 CE. ... 2+10+8+14, 3+9+7+15, and 2+6+12+14 ...

7. Chinese multiplication table - Wikipedia

   en.wikipedia.org/wiki/Chinese_multiplication_table

   The Chinese multiplication table is the first requisite for using the Rod calculus for carrying out multiplication, division, the extraction of square roots, and the solving of equations based on place value decimal notation. It was known in China as early as the Spring and Autumn period, and survived through the age of the abacus; pupils in ...