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2. Ages of Three Children puzzle - Wikipedia

   en.wikipedia.org/wiki/Ages_of_Three_Children_puzzle

   The Ages of Three Children puzzle (sometimes referred to as the Census-Taker Problem [1]) is a logical puzzle in number theory which on first inspection seems to have insufficient information to solve. However, with closer examination and persistence by the solver, the question reveals its hidden mathematical clues, especially when the solver ...

3. Multiplication algorithm - Wikipedia

   en.wikipedia.org/wiki/Multiplication_algorithm

   A multiplication algorithm is an algorithm ... Looking both those values up on the table yields 36 and 9, the difference of which is 27, which is the product of 9 and ...

4. Grid method multiplication - Wikipedia

   en.wikipedia.org/wiki/Grid_method_multiplication

   The grid method (also known as the box method) of multiplication is an introductory approach to multi-digit multiplication calculations that involve numbers larger than ten. Because it is often taught in mathematics education at the level of primary school or elementary school , this algorithm is sometimes called the grammar school method.

5. Mental calculation - Wikipedia

   en.wikipedia.org/wiki/Mental_calculation

   For any 2-digit by 2-digit multiplication problem, if both numbers end in five, the following algorithm can be used to quickly multiply them together: [1] E x : 35 × 75 {\displaystyle \mathrm {Ex} :35\times 75}

6. Euclidean algorithm - Wikipedia

   en.wikipedia.org/wiki/Euclidean_algorithm

   Synonyms for GCD include greatest common factor (GCF), highest common factor (HCF), highest common divisor (HCD), and greatest common measure (GCM). The greatest common divisor is often written as gcd( a , b ) or, more simply, as ( a , b ) , [ 3 ] although the latter notation is ambiguous, also used for concepts such as an ideal in the ring of ...

7. Multiplicative group of integers modulo n - Wikipedia

   en.wikipedia.org/wiki/Multiplicative_group_of...

   This implies that the multiplication is associative, commutative, and that the class of 1 is the unique multiplicative identity. Finally, given a , the multiplicative inverse of a modulo n is an integer x satisfying ax ≡ 1 (mod n ) .