# Show how to calculate mentally and indicate the properties used

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• Mar 14th 2013, 03:22 PM
maddiexoxo
Show how to calculate mentally and indicate the properties used
Show how to calculate mentally and indicate the properties used

15% of 260
• Mar 14th 2013, 03:55 PM
Plato
Re: Show how to calculate mentally and indicate the properties used
Quote:

Originally Posted by maddiexoxo
Show how to calculate mentally and indicate the properties used
15% of 260

@maddiexoxo, you have posted a number of posts. Each of then seem to say "Do this for me".

Is that a command? If it is then you are sadly misinformed.
This is not a homework service. You can pay for that.
This is a free help service. But we cannot help is you only post the question.
• Mar 14th 2013, 04:04 PM
Soroban
Re: Show how to calculate mentally and indicate the properties used
Hello, maddiexoxo!

Quote:

Show how to calculate mentally and indicate the properties used: . $15\%\text{ of }260$

$\begin{array}{cccccc}\text{We know:} & 10\%\text{ of }260 &=& 26 && \frac{1}{10}\text{ of }260 \\ \\[-3mm] \text{Then:} & 5\%\text{of }260 &=& 13 && \text{half of }10\% \\ \\[-3mm] \text{Hence:} & 15\%\text{ of }260 &=& 39 && \text{addition} \end{array}$