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.
Hello, maddiexoxo!
Show how to calculate mentally and indicate the properties used: .$\displaystyle 15\%\text{ of }260$
$\displaystyle \begin{array}{cccccc}\text{We know:} & 10\%\text{ of }260 &=& 26 && \frac{1}{10}\text{ of }260 \\ \\[-3mm] \text{Then:} & 5\%\text{of }260 &=& 13 && \text{half of }10\% \\ \\[-3mm] \text{Hence:} & 15\%\text{ of }260 &=& 39 && \text{addition} \end{array}$