we know that
\(1\ tens=10 \\1\ hundred=100\)
so
1) the expression \(17\ tens\) is equal in numbers to
\(17\ tens=17*10=170\)
2) the expression \(1\ hundred\ 7\ tens\) is equal in numbers to
\(1\ hundred\ 7\ tens=1*100+7*10=100+70=170\)
therefore
\(17\ tens\) and \(1\ hundred\ 7\ tens\) have the same value
