Question

The screen on Brianna's new phone is 2.85 centimeters long

Answer 1

Well, let's first convert it to a fraction... notice 2.85 has two decimals, so we'll use 2 zeros at the bottom, with a 1, and lose the dot.

$\bf 2.\underline{85}\implies \cfrac{285}{1\underline{00}}\implies \cfrac{57}{20} \\\\\\ \textit{20 goes into 57 twice, with a \underline{remainder} of 17}\qquad 2\frac{17}{20}$