Melody

100% of what?

100% of 81000=81000

so 

81000+81000=162000

There is no school level expansion of this.   

No, Yours is probably the BEST long division that i have seen presented on the forum (or other forums for that matter)

I have done algebraic division using LaTex.  It was alright but not supurb.  

This was one of my attempts at algebraic division using LaTex

-1000=5t(6.73-t)

$$\begin{array}{rll}
-1000&=&5t(6.73-t)\\
-200&=&t(6.73-t)\\
-200&=&6.73t-t^2\\
t^2-6.73t-200&=&0\\
t&=&\frac{6.73\pm\sqrt{6.73^2+4*1*200}}{2}

\end{array}$$

$${{\mathtt{t}}}^{{\mathtt{2}}}{\mathtt{\,-\,}}{\mathtt{6.73}}{\mathtt{\,\times\,}}{\mathtt{t}}{\mathtt{\,-\,}}{\mathtt{200}} = {\mathtt{0}} \Rightarrow \left\{ \begin{array}{l}{\mathtt{t}} = {\mathtt{\,-\,}}{\frac{\left({\sqrt{{\mathtt{8\,452\,929}}}}{\mathtt{\,-\,}}{\mathtt{673}}\right)}{{\mathtt{200}}}}\\
{\mathtt{t}} = {\frac{\left({\sqrt{{\mathtt{8\,452\,929}}}}{\mathtt{\,\small\textbf+\,}}{\mathtt{673}}\right)}{{\mathtt{200}}}}\\
\end{array} \right\} \Rightarrow \left\{ \begin{array}{l}{\mathtt{t}} = -{\mathtt{11.171\: \!960\: \!652\: \!075\: \!797\: \!6}}\\
{\mathtt{t}} = {\mathtt{17.901\: \!960\: \!652\: \!075\: \!797\: \!6}}\\
\end{array} \right\}$$

I watched the video Heureka but I don't get how it helps with 0 * infinty  ?

455 /24

there is a calc on the home page.

NO real number squared = a negative number.

a negative * a negative = a positive

and

a positive * a positive = a positive

So there is no real answer.

the imaginary answer is  6i

That is a rather unique way of looking at this problem Heureka.  

Thanks Geno and Heureka   

There was some good teaching and learning happening here  - That is great to see  

Thanks J*z123 and mathematician  

−3p−4(−p+5)

=−3p +  (−4)(−p+5)

=  -3     +    4p-20

=  -23 + 4p