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  2. 1 + 2 + 3 + 4 + ⋯ - ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%2B_2_%2B_3_%2B_4_%2B_%E...

    The total amount to be subtracted is 4 + 8 + 12 + 16 + ⋯, which is 4 times the original series. These relationships can be expressed using algebra. These relationships can be expressed using algebra.

  3. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    For instance, the numeral for 10,405 uses one time the symbol for 10,000, four times the symbol for 100, and five times the symbol for 1. A similar well-known framework is the Roman numeral system . It has the symbols I, V, X, L, C, D, M as its basic numerals to represent the numbers 1, 5, 10, 50, 100, 500, and 1000.

  4. Division by zero - Wikipedia

    en.wikipedia.org/wiki/Division_by_zero

    The quotitive concept of division lends itself to calculation by repeated subtraction: dividing entails counting how many times the divisor can be subtracted before the dividend runs out. Because no finite number of subtractions of zero will ever exhaust a non-zero dividend, calculating division by zero in this way never terminates. [3]

  5. Multiplication table - Wikipedia

    en.wikipedia.org/wiki/Multiplication_table

    In mathematics, a multiplication table (sometimes, less formally, a times table) is a mathematical table used to define a multiplication operation for an algebraic system. The decimal multiplication table was traditionally taught as an essential part of elementary arithmetic around the world, as it lays the foundation for arithmetic operations ...

  6. Rounding - Wikipedia

    en.wikipedia.org/wiki/Rounding

    For example, replacing $ 23.4476 with $ 23.45, the fraction 312/937 with 1/3, or the expression √2 with 1.414. Rounding is often done to obtain a value that is easier to report and communicate than the original.

  7. List of countries by population growth rate - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    The table below shows annual population growth rate history and projections for various areas, countries, regions and sub-regions from various sources for various time periods.

  8. 1936 United States presidential election in North Dakota

    en.wikipedia.org/wiki/1936_United_States...

    The “favorite son” effect and the state's extreme isolationism meant Lemke received 13.41 percent of his home state's vote – over four and a half times the 2.88 percent of on-ballot votes he won nationally.

  9. List of countries by income inequality - Wikipedia

    en.wikipedia.org/wiki/List_of_countries_by...

    This is a list of countries and territories by income inequality metrics, as calculated by the World Bank, UNU-WIDER, OCDE, and World Inequality Database, based on different indicators, like Gini coefficient and specific income ratios.