\[\boxed{\mathbf{Проверочная\ работа\ №1.\ Действие\ умножения.\ Свойства\ умножения}}\]
\[\boxed{\mathbf{1.}}\]
\[15 \cdot 4 = 60\]
\[\boxed{\mathbf{2.}}\]
\[16 + 4 = 20\]
\[\boxed{\mathbf{3.}}\]
\[20 \cdot 6 = 120\]
\[\boxed{\mathbf{4.}}\]
\[4 \cdot 25 = 100\]
\[\boxed{\mathbf{5.}}\]
\[50 + 50 + 50 + 50 = 50 \cdot 4 =\]
\[= 200\]
\[\boxed{\mathbf{6.}}\]
\[38y\]
\[\boxed{\mathbf{7.}}\]
\[m + 15\]
\[\boxed{\mathbf{8.}}\]
\[16x\]