The Kingdom of Infinite Number: A Field GuideHenry Holt and Company, 15 сент. 2001 г. - Всего страниц: 398 Just as bird guides help watchers tell birds apart by their color, songs, and behavior, The Kingdom of Infinite Number is the perfect handbook for identifying numbers in their native habitat. Taking a field guide-like approach, it offers a fresh way of looking at individual numbers and the properties that make them unique, which are also the properties essential for mental computation. The result provides new insights into mathematical patterns and relationships and an increased appreciation for the sheer wonder of numbers. |
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... problems. Just as nearly everyone can recognize a robin on the lawn or crow's caw from the sound, most adults can easily spot one of the smaller perfect squares, such as 25 or 49. But the adept birder identifies which warbler is singing ...
... problem, the final question in the 1997 U.S. national Mathcounts competition: “Shelly's total cost for a mountain bike is $900, including tax and interest. Her first payment is 25 percent of the cost and she pays the remainder of the ...
... problem, which I solved quickly before reading the winner's analysis. I immediately thought of 25% as one fourth, which is half of 1/2. Using this, half of $900 is $450 and half of that is $225. But since I recognized 225 as the square ...
... problems . Errors in remembering , however , cannot be checked against the mental number line . A person who somehow remembers 6 x 8 as 84 instead of 48 and has lost the mental number line ( or fails to use it ) will not notice the ...
... problem at all as the teacher expected , which was to say 1 + 2 is 3 , 3 + 3 is 6 , 6 + 4 is 10 , and continue in that way to 100. Instead , Gauss began by thinking 1 + 100 is 101. Also , 2 + 99 is 101 , the same sum . This pattern will ...
Содержание
Genera Integral and Rational Signed Numbers | |
Genus Rational | |
Genus Real NumberLine Numbers | |
Genus Complex AllInclusive Numbers | |
Kingdom Infinity | |
A Note on Taxonomy | |