\[\boxed{\mathbf{Проверочная\ работа\ №3.\ Проценты}}\]
\[\boxed{\text{1.}}\]
\[0,023 = 2,3\%.\ \ \ \]
\[\boxed{\text{2.}}\]
\[\frac{3}{4} = \frac{3}{4} \cdot 100\% = 0,75 \cdot 100\% =\]
\[= 75\%.\ \ \ \]
\[\boxed{\text{3.}}\]
\[300\ :100 \cdot 2 = 3 \cdot 2 = 6.\ \ \ \]
\[\boxed{\text{4.}}\]
\[60\ :100 \cdot 30 = 0,6 \cdot 30 = 18.\ \ \ \]
\[\boxed{\text{5.}}\]
\[600\ :100 \cdot 150 = 6 \cdot 150 = 900.\ \ \ \]
\[\boxed{\text{6.}}\]
\[Нет.\]
\[40\ :20 \cdot 100 = 2 \cdot 100 = 200.\ \ \ \]
\[\boxed{\text{7.}}\]
\[Да.\ \ \]
\[\frac{3}{5} = \frac{3}{5} \cdot 100\ \% = 0,6 \cdot 100\ \% =\]
\[= 60\ \%.\ \ \ \]
\[\boxed{\text{8.}}\]
\[Да.\]