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  2. Elementary arithmetic - Wikipedia

    en.wikipedia.org/wiki/Elementary_arithmetic

    This is known as the commutative property of addition. (a + b) and (b + a) produce the same output. [7] [8] 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]

  3. Addition - Wikipedia

    en.wikipedia.org/wiki/Addition

    The total amount of shapes are 5, which is a consequence of the addition of the objects from the two sets (3 + 2 = 5). Possibly the most basic interpretation of addition lies in combining sets : When two or more disjoint collections are combined into a single collection, the number of objects in the single collection is the sum of the numbers ...

  4. 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.

  5. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    For example, in the method addition with carries, the two numbers are written one above the other. Starting from the rightmost digit, each pair of digits is added together. The rightmost digit of the sum is written below them. If the sum is a two-digit number then the leftmost digit, called the "carry", is added to the next pair of digits to ...

  6. Literacy in the United States - Wikipedia

    en.wikipedia.org/wiki/Literacy_in_the_United_States

    The tutoring model's components can ensure that service from a non-certified tutor can in fact prove to be effective by “engaging reading materials that are carefully graded in difficulty"; offering "a sequenced word study or phonics curriculum"; "regularly scheduled tutoring sessions (at least two each week)"; "a committed group of non ...

  7. Carry (arithmetic) - Wikipedia

    en.wikipedia.org/wiki/Carry_(arithmetic)

    During the addition, each carry is "signaled" rather than performed, and during the carry cycle, the machine increments the digits above the "triggered" digits. This operation has to be performed sequentially, starting with the ones digit, then the tens, the hundreds, and so on, since adding the carry can generate a new carry in the next digit.

  8. Digit sum - Wikipedia

    en.wikipedia.org/wiki/Digit_sum

    Digit sums and digital roots can be used for quick divisibility tests: a natural number is divisible by 3 or 9 if and only if its digit sum (or digital root) is divisible by 3 or 9, respectively. For divisibility by 9, this test is called the rule of nines and is the basis of the casting out nines technique for checking calculations.

  9. Mnemonic major system - Wikipedia

    en.wikipedia.org/wiki/Mnemonic_major_system

    Learning a vocabulary of 3-digit numbers is harder, because ten times more images need to be learned for each extra digit. Many mnemonists, however, can use a set of over 1000 images. The combination of images into a narrative is easier to do rapidly than forming a coherent grammatical sentence.

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