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  2. Number bond - Wikipedia

    en.wikipedia.org/wiki/Number_bond

    In mathematics education at primary school level, a number bond (sometimes alternatively called an addition fact) is a simple addition sum which has become so familiar that a child can recognise it and complete it almost instantly, with recall as automatic as that of an entry from a multiplication table in multiplication.

  3. Method of complements - Wikipedia

    en.wikipedia.org/wiki/Method_of_complements

    In grade schools, students are sometimes taught the method of complements as a shortcut useful in mental arithmetic. [3] Subtraction is done by adding the ten's complement of the subtrahend, which is the nines' complement plus 1. The result of this addition is used when it is clear that the difference will be positive, otherwise the ten's ...

  4. JumpStart 2nd Grade - Wikipedia

    en.wikipedia.org/wiki/JumpStart_2nd_Grade

    JumpStart 2nd Grade (known as Jump Ahead Year 2 in the United Kingdom) is a video game released on 26 March 1996 by Knowledge Adventure. As its name suggests, it was made to teach second grade students.

  5. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    Counting is a type of repeated addition in which the number 1 is continuously added. [46] Subtraction is the inverse of addition. In it, one number, known as the subtrahend, is taken away from another, known as the minuend. The result of this operation is called the difference. The symbol of subtraction is . [47]

  6. JumpStart Advanced 2nd Grade - Wikipedia

    en.wikipedia.org/wiki/JumpStart_Advanced_2nd_Grade

    Edison: (Voiced by Dee Bradley Baker) C.J.'s firefly sidekick who also debuts in the original 2nd Grade. In this game, he seems to dislike adventuring (once expressing that he wishes the gadget pieces were hidden in "quiet places" like golf courses and petting zoos) and, as in most games made after 2nd Grade where he appears, sports an Irish ...

  7. Fact Monster - Wikipedia

    en.wikipedia.org/wiki/Fact_Monster

    Fact Monster is an educational technology website geared towards children. [1] It is owned by Infoplease [ 1 ] and, like the Infoplease site, it contains several reference works under one umbrella, including the Columbia Encyclopedia , Random House Dictionary , an atlas and an almanac.

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