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The products of small numbers may be calculated by using the squares of integers; for example, to calculate 13 × 17, one can remark 15 is the mean of the two factors, and think of it as (15 − 2) × (15 + 2), i.e. 15 2 − 2 2. Knowing that 15 2 is 225 and 2 2 is 4, simple subtraction shows that 225 − 4 = 221, which is the desired product.
Numerical cognition is a subdiscipline of cognitive science that studies the cognitive, developmental and neural bases of numbers and mathematics. As with many cognitive science endeavors, this is a highly interdisciplinary topic, and includes researchers in cognitive psychology, developmental psychology, neuroscience and cognitive linguistics.
Anders Bodelsen (11 February 1937 – 17 October 2021) was a Danish writer primarily associated with the 1960 new-realism wave in Danish literature, along with Christian Kampmann and Henrik Stangerup. Bodelsen preferred the social-realistic style of writing, often thrillers about middle-class people who face the consequences of materialism ...
978-0-307-58892-0. OCLC. 427644829. Think of a Number is the debut novel of John Verdon published in 2010. It is a detective novel about a retired New York City homicide detective named Dave Gurney. [1][2] It is the beginning of a saga that continues with its 2011 follow-up Shut Your Eyes Tight. In 2012 a third novel in the David Gurney series ...
The interesting number paradox is a humorous paradox which arises from the attempt to classify every natural number as either "interesting" or "uninteresting". The paradox states that every natural number is interesting. [1] The "proof" is by contradiction: if there exists a non-empty set of uninteresting natural numbers, there would be a ...
Repeating decimal. A repeating decimal or recurring decimal is a decimal representation of a number whose digits are eventually periodic (that is, after some place, the same sequence of digits is repeated forever); if this sequence consists only of zeros (that is if there is only a finite number of nonzero digits), the decimal is said to be ...
Ball was a regular fixture on children's television from the mid 1970s and throughout the 1980s, presenting several series of science and technology programmes intended for children (including Think of a Number; Think Again; Think Backwards; Think...This Way and Johnny Ball Reveals All).
The approximate number system (ANS) is a cognitive system that supports the estimation of the magnitude of a group without relying on language or symbols. The ANS is credited with the non-symbolic representation of all numbers greater than four, with lesser values being carried out by the parallel individuation system, or object tracking system. [1]