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  2. Elementary arithmetic - Wikipedia

    en.wikipedia.org/wiki/Elementary_arithmetic

    The predecessor of a natural number (excluding zero) is the previous natural number and is the result of subtracting one from that number. For example, the successor of zero is one, and the predecessor of eleven is ten ( 0 + 1 = 1 {\displaystyle 0+1=1} and 11 − 1 = 10 {\displaystyle 11-1=10} ).

  3. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    In what is known in the United States as traditional mathematics, a specific process is taught to students at the end of the 1st year (or during the 2nd year) for use with multi-digit whole numbers, and is extended in either the fourth or fifth grade to include decimal representations of fractional numbers.

  4. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    A similar procedure is used for subtraction. If the two numbers do not have the same denominator then they must be transformed to find a common denominator. This can be achieved by scaling the first number with the denominator of the second number while scaling the second number with the denominator of the first number.

  5. Exercise (mathematics) - Wikipedia

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

    At the Russian School of Mathematics, students begin multi-step problems as early as the first grade, learning to build on previous results to progress towards the solution. In the 1960s, collections of mathematical exercises were translated from Russian and published by W. H. Freeman and Company : The USSR Olympiad Problem Book (1962), [ 8 ...

  6. Numeracy - Wikipedia

    en.wikipedia.org/wiki/Numeracy

    The assessment included tests for number, algebra (also called patterns and relationships at fourth grade), measurement, geometry, and data. The latest study, in 2003, found that children from Singapore at both grade levels had the highest performance. Countries like Hong Kong SAR, Japan, and Taiwan also shared high levels of numeracy.

  7. Didi & Ditto - Wikipedia

    en.wikipedia.org/wiki/Didi_&_Ditto

    Didi & Ditto First Grade: The Wolf King is the second title of Didi & Ditto educational software series created by Kutoka Interactive. Release in late 2005 in Canada and the United States , the game teaches first grade notions to children between 5 and 7 years old. [ 14 ]

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