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goh shu lingon 7 January 2013
Transcript of Real Numbers
Bei Qian Rational and irrational numbers Are Real Numbers used in real life? Real Numbers Conclusion Real numbers are vital for everyday life. We use them for quantities such as age, price, size, or population. Real numbers are numbers that exist on a number line, and can be expressed, regardless if they are rational, or irrational. A rational number is a number that can be written as a simple fraction
2.5 is a rational number because 2.5 = 5/2 (can be written as a fraction)
An Irrational Number is a real number that cannot be written as a simple fraction.It cannot be written as a ratio of two integers...
Example:π (pi) is an irrational numberπ=3.1415897932384626433832795…(unable to write down a simple fraction that is equals to π)
The popular approximation of 22/7 = 3.1428571428571... (It is close but is not accurate) Real numbers are used in our daily lives for even the simplest things like paying the bus fare, sharing food or walking.
How?Sharing a pizza or a bag of popcorn, means each of you get a certain fraction of it which means that real numbers are used.eg.(Each person gets 1/4 of a pizza)
Interest on a savings account uses fractions. .Taxes on gasoline are fractions of the amount purchased.
The pictures on a television has a constant 4/3 width to height ratio.
The plumber has to make the slope of the waste line a basic fraction of 1/4 inch per foot so as to prevent the liquid from running out from under the solids or the clogging up of the line if it was too steep.
If you ride a bike or drive a car, the gear ratios help you accelerate, climb or cruise. The real number system consists of whole numbers, integers, natural numbers, rational numbers and irrational numbers.