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numeracy-approval@world.std.com

Posts: 87
Registered: 12/6/04
(no subject)
Posted: Sep 14, 2007 11:02 PM
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---------- Forwarded message ----------
From: "Richard Boone" <rboone@vineland.org>
To: <numeracy@europe.std.com>
Subject: RE: Exponents: getting the value of x.
Date: Wed, 12 Sep 2007 10:37:55 -0400
Sender: numeracy-approval@world.std.com
Precedence: list
Reply-To: numeracy

Now that we have broken it down we could say:

Log(base2)16 = 4



-----Original Message-----
From: numeracy-approval@world.std.com
[mailto:numeracy-approval@world.std.com] On Behalf Of Lynda Ginsburg
Sent: Monday, September 10, 2007 11:06 PM
To: numeracy@europe.std.com
Subject: Re: Exponents: getting the value of x.

Alternatively, starting with 16, you could keep dividing by 2 until the
quotient is 1, and then count up the number of times you divided by 2 (or
the number of times 2 was a factor).

16/2 = 8
8/2 = 4
4/2 = 2
2/2 = 1

You divided 16 by 2 four times, therefore 2^4 = 16

Lynda

Martha Haehl wrote:
> Do you mean how would this be solved algebraically? Guess and check would
> not require a calculator. Try 2^1 then 2^2, 2^3, 2^4.
>
> Martha
>

>>>> bomber32 <discussions@mathforum.org> 09/03/07 10:25 PM >>>
> 2^4 = 16
>
> now
>
> 2^x = 16
>
> we all know that x = 4. But how exactly do we get x without using a
> calculator?
>
>
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--
Lynda Ginsburg
Senior Research Associate, MetroMath
Rutgers University
tel: 732-445-1409


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