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  2. Skip counting - Wikipedia

    en.wikipedia.org/wiki/Skip_counting

    Skip counting is a mathematics technique taught as a kind of multiplication in reform mathematics textbooks such as TERC. In older textbooks, this technique is called counting by twos (threes, fours, etc.). In skip counting by twos, a person can count to 10 by only naming every other even number: 2, 4, 6, 8, 10. [1]

  3. List of numeral systems - Wikipedia

    en.wikipedia.org/wiki/List_of_numeral_systems

    A binary clock might use LEDs to express binary values. In this clock, each column of LEDs shows a binary-coded decimal numeral of the traditional sexagesimal time.. The common names are derived somewhat arbitrarily from a mix of Latin and Greek, in some cases including roots from both languages within a single name. [27]

  4. Dyscalculia - Wikipedia

    en.wikipedia.org/wiki/Dyscalculia

    [9] [10] Estimates of the prevalence of dyscalculia range between 3 and 6% of the population. [9] [10] In 2015 it was established that 11% of children with dyscalculia also have attention deficit hyperactivity disorder (ADHD). [11] Dyscalculia has also been associated with Turner syndrome [12] and people who have spina bifida. [13]

  5. Numeral system - Wikipedia

    en.wikipedia.org/wiki/Numeral_system

    In base 10, ten different digits 0, ..., 9 are used and the position of a digit is used to signify the power of ten that the digit is to be multiplied with, as in 304 = 3×100 + 0×10 + 4×1 or more precisely 3×10 2 + 0×10 1 + 4×10 0. Zero, which is not needed in the other systems, is of crucial importance here, in order to be able to "skip ...

  6. Finger-counting - Wikipedia

    en.wikipedia.org/wiki/Finger-counting

    Chinese number gestures count up to 10 but can exhibit some regional differences. In Japan, counting for oneself begins with the palm of one hand open. Like in East Slavic countries, the thumb represents number 1; the little finger is number 5. Digits are folded inwards while counting, starting with the thumb. [7] A closed palm indicates number 5.

  7. macOS version history - Wikipedia

    en.wikipedia.org/wiki/MacOS_version_history

    The history of macOS, Apple's current Mac operating system formerly named Mac OS X until 2011 and then OS X until 2016, began with the company's project to replace its "classic" Mac OS. That system, up to and including its final release Mac OS 9 , was a direct descendant of the operating system Apple had used in its Mac computers since their ...

  8. 10 - Wikipedia

    en.wikipedia.org/wiki/10

    10 (ten) is the even natural number following 9 and preceding 11. Ten is the base of the decimal numeral system , the most common system of denoting numbers in both spoken and written language. Linguistics

  9. COVID-19 pandemic in the United States - Wikipedia

    en.wikipedia.org/wiki/COVID-19_pandemic_in_the...

    The first American case was reported on January 20, [9] and Health and Human Services Secretary Alex Azar declared a public health emergency on January 31. [10] Restrictions were placed on flights arriving from China, [ 11 ] [ 12 ] but the initial U.S. response to the pandemic was otherwise slow in terms of preparing the healthcare system ...