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2. Chisanbop - Wikipedia

   en.wikipedia.org/wiki/Chisanbop

   Counting from 1 to 20 in Chisanbop. Each finger has a value of one, while the thumb has a value of five. Therefore each hand can represent the digits 0-9, rather than the usual 0-5. The two hands combine to represent two digits; the right hand is the ones place, and the left hand is the tens place.

3. Counting measure - Wikipedia

   en.wikipedia.org/wiki/Counting_measure

   The counting measure can be defined on any measurable space (that is, any set along with a sigma-algebra) but is mostly used on countable sets. [ 1 ] In formal notation, we can turn any set X {\displaystyle X} into a measurable space by taking the power set of X {\displaystyle X} as the sigma-algebra Σ ; {\displaystyle \Sigma ;} that is, all ...

4. Order of operations - Wikipedia

   en.wikipedia.org/wiki/Order_of_operations

   The order of operations, that is, the order in which the operations in an expression are usually performed, results from a convention adopted throughout mathematics, science, technology and many computer programming languages.

5. Pigeonhole principle - Wikipedia

   en.wikipedia.org/wiki/Pigeonhole_principle

   This seemingly obvious statement, a type of counting argument, can be used to demonstrate possibly unexpected results. For example, given that the population of London is more than one unit greater than the maximum number of hairs that can be on a human's head, the principle requires that there must be at least two people in London who have the ...

6. Mathcounts - Wikipedia

   en.wikipedia.org/wiki/Mathcounts

   The Math Video Challenge program allowed students in teams of 4 to create a video that explained the solution to a problem from the Mathcounts School Handbook in a real-world scenario. The program was discontinued in 2023, but a similar video project opportunity is offered through the National Math Club.

7. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   Counting assigns a natural number to each object in a set, starting with 1 for the first object and increasing by 1 for each subsequent object. The number of objects in the set is the count. This is also known as the cardinality of the set. Counting can also be the process of tallying, the process of drawing a mark for each object in a set.