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  2. Positional notation - Wikipedia

    en.wikipedia.org/wiki/Positional_notation

    Weights of 1, 3, 9, ..., 3 n known units can be used to determine any unknown weight up to 1 + 3 + ... + 3 n units. A weight can be used on either side of the balance or not at all. Weights used on the balance pan with the unknown weight are designated with 1, with 1 if used on the empty pan, and with 0 if not used.

  3. Third grade - Wikipedia

    en.wikipedia.org/wiki/Third_grade

    Third grade (also 3rd Grade or Grade 3) is the third year of formal or compulsory education. It is the third year of primary school . Children in third grade are usually 8–9 years old.

  4. Central place theory - Wikipedia

    en.wikipedia.org/wiki/Central_place_theory

    Central place theory is an urban geographical theory that seeks to explain the number, size and range of market services in a commercial system or human settlements in a residential system. [1] It was introduced in 1933 to explain the spatial distribution of cities across the landscape. [ 2 ]

  5. Central Board of Secondary Education - Wikipedia

    en.wikipedia.org/wiki/Central_Board_of_Secondary...

    For the Class 10 and Class 12 exams, CBSE (along with the marks obtained) includes the positional grade obtained by the student, which is dependent on the average performance of the students in that subject. Consequently, the cutoffs required to obtain a particular grade vary every year.

  6. Place value - Wikipedia

    en.wikipedia.org/?title=Place_value&redirect=no

    This page was last edited on 1 February 2019, at 19:51 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  7. Standard algorithms - Wikipedia

    en.wikipedia.org/wiki/Standard_algorithms

    For example, through the standard addition algorithm, the sum can be obtained by following three rules: a) line up the digits of each addend by place value, longer digit addends should go on top, b) each addend can be decomposed -- ones are added with ones, tens are added with tens, and so on, and c) if the sum of the digits of the current place value is ten or greater, then the number must be ...

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