Teacher2Teacher 
Q&A #4319 
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From: Raffaele Valente <rvalente@iol.it> To: Teacher2Teacher Public Discussion Date: 2007103008:38:13 Subject: Re: Estimation: Order of Magnitude, Compensation Given any number n, his Order Of Magnitude (OOM) is the power of ten closest to n. For instance 160.000.000 has OOM equals to 100.000.000 ie 10^8 0.00129 has OOM 10^3 and so on For instance light speed in kilometers is 300.000 km/sec so a light year is 365 times 86.4000 times 300.000 kilometers that is 9.460.800.000.000 its OOM is 10^10 you explain powers and their properties positive and negative exponents both This is the way I teach negative powers to my 14 years old student 10^2 is 10^3/10^5 10x10x10  10x10x10x10x10 three ten on numerator cancel with three ten on denominator so 10^(35)=10^(2)=1/10^2 you can also explain why 0 raised to 0 doesn't make sense as 0/0 is not determinate hope this helps bye Raffaele
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