This is a subtraction problem because we want to know how many slices will be left after we eat some. Since we are eating slices, or taking slices away, we will have less than what we started with. 

We can start at \(\displaystyle 12\) and count back \(\displaystyle 3\).

\(\displaystyle 12,11,10,9\)

\(\displaystyle \frac{\begin{array}[b]{r}12\\ -\ 3\end{array}}{ \ \ \ \ \space 9}\)

This is an addition problem because we want to know how many total pieces of fruit Emily has when we put the blueberries, strawberries, and rapsberries together. When we put things together we are adding. 

We can start at \(\displaystyle 8\) and count up \(\displaystyle 4\).

\(\displaystyle 8,9,10,11,12\)

Then we can count up \(\displaystyle 5\).

\(\displaystyle 12,13,14,15,16,17\)

\(\displaystyle \frac{\begin{array}[b]{r}8\\ 4\\+\ 5\end{array}}{ \ \ \space 17}\)

This is an addition problem because we want to know how many total bottles the store has been we put the juice, soda, and water bottles together. When we put things together we are adding. 

We can start at \(\displaystyle 6\) and count up \(\displaystyle 3\).

\(\displaystyle 6,7,8,9\)

Then we can count up \(\displaystyle 3\).

\(\displaystyle 9,10,11,12\)

\(\displaystyle \frac{\begin{array}[b]{r}6\\ 3\\+\ 3\end{array}}{ \ \ \space 12}\)

This is an addition problem because we want to know how many total coins Suzzy found when she puts all the coins together. When we put things together we are adding. 

We can start at \(\displaystyle 13\) and count up \(\displaystyle 4\).

\(\displaystyle 13,14,15,16,17\)

Then we can count up \(\displaystyle 2\).

\(\displaystyle 17,18,19\)

\(\displaystyle \frac{\begin{array}[b]{r}13\\ 4\\+\ 2\end{array}}{ \ \ \space 19}\)

This is an addition problem because we want to know how many total bears the carnival game has when we put the three sizes together. When we put things together we are adding. 

We can start at \(\displaystyle 5\) and count up \(\displaystyle 12\).

\(\displaystyle 5,6,7,8,9,10,11,12,13,14,15,16,17\)

Then we can count up \(\displaystyle 3\).

\(\displaystyle 17,18,19,20\)

\(\displaystyle \frac{\begin{array}[b]{r}5\\ 12\\+\ 3\end{array}}{ \ \ \space 20}\)

This is an addition problem because we want to know how many total gumballs there are when we put all the colors together. When we put things together we are adding. 

We can start at \(\displaystyle 6\) and count up \(\displaystyle 11\).

\(\displaystyle 6,7,8,9,10,11,12,13,14,15,16,17\)

Then we can count up \(\displaystyle 2\).

\(\displaystyle 17,18,19\)

\(\displaystyle \frac{\begin{array}[b]{r}6\\ 11\\+\ 2\end{array}}{ \ \ \space 19}\)

This is an addition problem because we want to know how many total flowers there are in all the pots put together. When we put things together we are adding. 

We can start at \(\displaystyle 9\) and count up \(\displaystyle 4\).

\(\displaystyle 9,10,11,12,13\)

Then we can count up \(\displaystyle 2\).

\(\displaystyle 13,14,15\)

\(\displaystyle \frac{\begin{array}[b]{r}9\\ 4\\+\ 2\end{array}}{ \ \ \space 15}\)

This is an addition problem because we want to know how many total points were scored when we put all the points together. When we put things together we are adding. 

We can start at \(\displaystyle 2\) and count up \(\displaystyle 6\).

\(\displaystyle 2,3,4,5,6,7,8\)

\(\displaystyle \frac{\begin{array}[b]{r}2\\ 0\\+\ 6\end{array}}{ \ \ \ \space 8}\)

This is an addition problem because we want to know how many pieces of candy when I put the sucker, chocolate and gummies together. When we put things together we are adding. 

We can start at \(\displaystyle 1\) and count up \(\displaystyle 7\).

\(\displaystyle 1,2,3,4,5,6,7,8\)

Then we can count up \(\displaystyle 3\).

\(\displaystyle 8,9,10,11\)

\(\displaystyle \frac{\begin{array}[b]{r}1\\ 7\\+\ 3\end{array}}{ \ \ \space 11}\)

This is an addition problem because we want to know how many total bags the family has altogether. When we put things together we are adding. 

We can start at \(\displaystyle 2\) and count up \(\displaystyle 1\).

\(\displaystyle 2,3\)

Then we can count up \(\displaystyle 4\).

\(\displaystyle 3,4,5,6,7\)

\(\displaystyle \frac{\begin{array}[b]{r}2\\ 1\\+\ 4\end{array}}{ \ \ \ \space 7}\)