Tiddle

$${{\mathtt{7}}}^{-{\mathtt{2}}} = {\frac{{\mathtt{1}}}{{\mathtt{49}}}} = {\mathtt{0.020\: \!408\: \!163\: \!265\: \!306\: \!1}}$$

Thank you!         

Thank you!

Yep!                                

Stop with these questions. You know the answer.

$${\mathtt{9}}{\mathtt{\,\times\,}}{\mathtt{8}}{\mathtt{\,\small\textbf+\,}}{\mathtt{7}}{\mathtt{\,\small\textbf+\,}}{\mathtt{6}}{\mathtt{\,\small\textbf+\,}}{\mathtt{5}}{\mathtt{\,\small\textbf+\,}}{\mathtt{4}}{\mathtt{\,\small\textbf+\,}}{\mathtt{3}}{\mathtt{\,\small\textbf+\,}}{\mathtt{2}}{\mathtt{\,\small\textbf+\,}}{\mathtt{1}} = {\mathtt{100}}$$

A prime number is a whole-number that is greater than 1 and only two whole-number factors are 1 and itself.

2, 3, 5, 7, 11, 13, 17