§ Цепочка (стр. 26)
\[\boxed{\text{Цепочка}\text{\ }\text{на}\text{\ }\text{стр}\text{.\ 26}}\]
\[630\ :70 = 9 \cdot 30 = 270 - 89 =\]
\[= 181 + 29 = 210\ :3 =\]
\[= 70 + 30 = 100.\]
\[\boxed{\text{Цепочка}\text{\ }\text{на}\text{\ }\text{стр}\text{.\ 26}}\]
\[630\ :70 = 9 \cdot 30 = 270 - 89 =\]
\[= 181 + 29 = 210\ :3 =\]
\[= 70 + 30 = 100.\]