Tuesday, August 19, 2014

Decimal numbers (English)

This video gives a precise definition of a decimal number as a special kind of rational number; one for which there is an expression a/b where a and b are integers, with b a power of ten. For such a number we can extend the Hindu-Arabic notation for integers by introducing the decimal form, with additional digits to the right of the decimal point. Visualizing decimal numbers requires a notion of successive magnifications on the number line.




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