Write the given numbers in tens and ones and match them with the correct models.

Match the following. One has been done for you.

Count backwards and write the missing numbers.

$\begin{array}{|cccccccccc|}\hline & 99& 98& & & & & & & \\ \hline\end{array}$

Count backwards and write the missing numbers.

$\begin{array}{|cccccccccc|}\hline 90& & & & & & & & & \\ \hline\end{array}$

Count backwards and write the missing numbers.

$\begin{array}{|cccccccccc|}\hline 80& & & 77& & & & & & 71\\ \hline\end{array}$

Count backwards and write the missing numbers.

$\begin{array}{|cccccccccc|}\hline 70& 69& & & & & & & & \\ \hline\end{array}$

Fill in the correct numbers.

Fill in the correct numbers.

Fill in the correct number.

$\boxed{ 79 } \boxed{ } \boxed{ 81 }$