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2. Casting out nines - Wikipedia

   en.wikipedia.org/wiki/Casting_out_nines

   The number 12565, for instance, has digit sum 1+2+5+6+5 = 19, which, in turn, has digit sum 1+9=10, which, in its turn has digit sum 1+0=1, a single-digit number. The digital root of 12565 is therefore 1, and its computation has the effect of casting out (12565 - 1)/9 = 1396 lots of 9 from 12565.

3. Multiplication - Wikipedia

   en.wikipedia.org/wiki/Multiplication

   Numbers can count (3 apples), order (the 3rd apple), or measure (3.5 feet high); as the history of mathematics has progressed from counting on our fingers to modelling quantum mechanics, multiplication has been generalized to more complicated and abstract types of numbers, and to things that are not numbers (such as matrices) or do not look ...

4. Order of operations - Wikipedia

   en.wikipedia.org/wiki/Order_of_operations

   For example, multiplication is granted a higher precedence than addition, and it has been this way since the introduction of modern algebraic notation. [2] [3] Thus, in the expression 1 + 2 × 3, the multiplication is performed before addition, and the expression has the value 1 + (2 × 3) = 7, and not (1 + 2) × 3 = 9.

5. Fraction - Wikipedia

   en.wikipedia.org/wiki/Fraction

   In decimal numbers greater than 1 (such as 3.75), the fractional part of the number is expressed by the digits to the right of the separator (with a value of 0.75 in this case). 3.75 can be written either as an improper fraction, ⁠ 375 / 100 ⁠, or as a mixed number, ⁠3 + 75 / 100 ⁠.

6. Whole number rule - Wikipedia

   en.wikipedia.org/wiki/Whole_number_rule

   The rule is a modified version of Prout's hypothesis proposed in 1815, to the effect that atomic weights are multiples of the weight of the hydrogen atom. [2] It is also known as the Aston whole number rule [3] after Francis W. Aston who was awarded the Nobel Prize in Chemistry in 1922 "for his discovery, by means of his mass spectrograph, of ...

7. Multiplication table - Wikipedia

   en.wikipedia.org/wiki/Multiplication_table

   Figure 2 is used for the multiples of 2, 4, 6, and 8. These patterns can be used to memorize the multiples of any number from 0 to 10, except 5. As you would start on the number you are multiplying, when you multiply by 0, you stay on 0 (0 is external and so the arrows have no effect on 0, otherwise 0 is used as a link to create a perpetual cycle).