Fill in the missing number: $18, 19, \underline{\hspace{1cm}}, 21, 22$.

Fill in the missing number: $55, 56, 57, \underline{\hspace{1cm}}, 59$.

Compare the numbers. Write $<, >,$ or $=$. $12 \_ 21$.

Compare the numbers. Write $<, >,$ or $=$. $35 \_ 35$.

What number comes just before $40$?

What number comes just after $89$?

What is $7 + 5$?

What is $12 + 3$?

What is $8 + 8$?

What is $15 - 8$?

What is $10 - 4$?

What is $17 - 9$?

Find the missing number: $6 + \_ = 10$.

Add these numbers: $\begin{aligned} 13 \\ + \ 5 \\ \hline \end{aligned}$

Subtract these numbers: $\begin{aligned} 18 \\ - \ 6 \\ \hline \end{aligned}$

How many tens and how many ones are in the number $47$?

Write the number that has $2$ tens and $5$ ones.

Draw bundles of ten sticks and single sticks to show the number $32$.

Complete the expanded form: $20 + 5 = \_$.

What is the expanded form of $60$?

What time is it when the hour hand points to $9$ and the minute hand points to $12$?

What time is it when the hour hand is between $2$ and $3$, and the minute hand points to $6$?

Draw the hour and minute hands on an analog clock face to show $7:00$.

Mia has $6$ red apples and $3$ green apples. How many apples does she have in total?

Tom has $7$ toy cars. His friend gives him $5$ more toy cars. How many toy cars does Tom have now?

There were $12$ birds on a tree. $4$ birds flew away. How many birds are left on the tree?

Lily had $10$ cookies. She ate $2$ cookies. How many cookies does Lily have now?