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2. Four fours - Wikipedia

   en.wikipedia.org/wiki/Four_fours

   For example, when d=4, the hash table for two occurrences of d would contain the key-value pair 8 and 4+4, and the one for three occurrences, the key-value pair 2 and (4+4)/4 (strings shown in bold). The task is then reduced to recursively computing these hash tables for increasing n , starting from n=1 and continuing up to e.g. n=4.

3. Elementary arithmetic - Wikipedia

   en.wikipedia.org/wiki/Elementary_arithmetic

   The sum of two numbers is unique; there is only one correct answer for a sums. [8] When the sum of a pair of digits results in a two-digit number, the "tens" digit is referred to as the "carry digit". [9] In elementary arithmetic, students typically learn to add whole numbers and may also learn about topics such as negative numbers and fractions.

4. Exercise (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Exercise_(mathematics)

   The student of arithmetic who has mastered the first four rules of his art and successfully striven with sums and fractions finds himself confronted by an unbroken expanse of questions known as problems. These are short stories of adventure and industry with the end omitted and, though betraying a strong family resemblance, are not without a ...

5. Arithmetic - Wikipedia

   en.wikipedia.org/wiki/Arithmetic

   Arithmetic is an elementary branch of mathematics that studies numerical operations like addition, subtraction, multiplication, and division. In a wider sense, it also includes exponentiation, extraction of roots, and taking logarithms. Arithmetic systems can be distinguished based on the type of numbers they operate on.

6. Wide Range Achievement Test - Wikipedia

   en.wikipedia.org/wiki/Wide_Range_Achievement_Test

   The test is appropriate for individuals aged 5 years through adult. The WRAT5 provides two equivalent forms (Blue and Green), which enables retesting within short periods of time without potential practice effects that occur from repeating the same items. The alternate forms also may be administered together in a single examination. [1]

7. Outline of arithmetic - Wikipedia

   en.wikipedia.org/wiki/Outline_of_arithmetic

   Fundamental theorem of arithmetic; Prime number – Number divisible by only 1 or itself Prime number theorem; Distribution of primes; Composite number – Number made of two smaller integers; Factor – A number that can be divided from its original number to get a whole number Greatest common factor – Greatest factor that is common between ...

8. Division (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Division_(mathematics)

   For example, 26 cannot be divided by 11 to give an integer. Such a case uses one of five approaches: Say that 26 cannot be divided by 11; division becomes a partial function. Give an approximate answer as a floating-point number. This is the approach usually taken in numerical computation.

9. The three Rs - Wikipedia

   en.wikipedia.org/wiki/The_three_Rs

   The three Rs [1] are three basic skills taught in schools: reading, writing and arithmetic", Reading, wRiting, and ARithmetic [2] or Reckoning. The phrase appears to have been coined at the beginning of the 19th century.