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  2. Yoruba numerals - Wikipedia

    en.wikipedia.org/wiki/Yoruba_numerals

    According to Lounge, [1] the Yoruba language has a rather elaborate vigesimal (base-20) numeral system that involves both addition and subtraction and multiplication. The base of the counting system is ogún 'twenty' (or 'score'). There are words for each of the decades; units in 1–4 are created by adding to these, while units in 5–9 are ...

  3. Arithmetic - Wikipedia

    en.wikipedia.org/wiki/Arithmetic

    Different types of numbers on a number line. Integers are black, rational numbers are blue, and irrational numbers are green. The main kinds of numbers employed in arithmetic are natural numbers, whole numbers, integers, rational numbers, and real numbers. [12] The natural numbers are whole numbers that start from 1 and go to infinity.

  4. Non-numerical words for quantities - Wikipedia

    en.wikipedia.org/wiki/Non-numerical_words_for...

    The English language has a number of words that denote specific or approximate quantities that are themselves not numbers. [1] Along with numerals, and special-purpose words like some, any, much, more, every, and all, they are quantifiers. Quantifiers are a kind of determiner and occur in many constructions with other determiners, like articles ...

  5. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    For single digit numbers simply duplicate the number into the tens digit, for example: 1 × 11 = 11, 2 × 11 = 22, up to 9 × 11 = 99. The product for any larger non-zero integer can be found by a series of additions to each of its digits from right to left, two at a time.

  6. Subtraction - Wikipedia

    en.wikipedia.org/wiki/Subtraction

    This picture is inadequate to describe what would happen after going 3 steps to the left of position 3. To represent such an operation, the line must be extended. To subtract arbitrary natural numbers, one begins with a line containing every natural number (0, 1, 2, 3

  7. Elon Musk's net worth tops $400 billion, a first for any person

    www.aol.com/elon-musks-net-worth-tops-210616638.html

    Tesla CEO Elon Musk has become the first person to top a net worth of $400 billion, according to Bloomberg News. Musk's wealth, which was last counted at $384 billion by the Bloomberg Billionaires ...

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