This is an addition problem because we have the difference in height from the question. The grill is $\displaystyle 70$ centimeters tall and fence is $\displaystyle 23$ centimeters taller than the grill, $\displaystyle 23$ is our difference. We can add our difference to the grill's height to find out how tall the fence is. 

$\displaystyle \frac{\begin{array}[b]{r}70\\ +\ 23\end{array}}{ \ \ \ \space 93}$

This is an addition problem because we have the difference in length from the question. The pillow is $\displaystyle 29$ centimeters long and couch is $\displaystyle 54$ centimeters longer than the pillow, $\displaystyle 26$ is our difference. We can add our difference to the pillow's length to find out how long the couch is. 

$\displaystyle \frac{\begin{array}[b]{r}29\\ +\ 54\end{array}}{ \ \ \ \space 83}$

This is an addition problem because we have the difference in height from the question. The lamp is $\displaystyle 17$ centimeters tall and wall is $\displaystyle 65$ centimeters taller than the lamp, $\displaystyle 65$ is our difference. We can add our difference to the lamp's height to find out how tall the wall is. 

$\displaystyle \frac{\begin{array}[b]{r}17\\ +\ 65\end{array}}{ \ \ \ \space 82}$

This is an addition problem because we have the difference in length from the question. The rug is $\displaystyle 79$ centimeters long and room is $\displaystyle 17$ centimeters longer than the rug, $\displaystyle 17$ is our difference. We can add our difference to the rug's length to find out how long the room is. 

$\displaystyle \frac{\begin{array}[b]{r}79\\ +\ 17\end{array}}{ \ \ \ \space 96}$

This is an addition problem because we have the difference in length from the question. The table is $\displaystyle 69$ centimeters long and room is $\displaystyle 25$ centimeters longer than the table, $\displaystyle 25$ is our difference. We can add our difference to the table's length to find out how long the room is. 

$\displaystyle \frac{\begin{array}[b]{r}69\\ +\ 25\end{array}}{ \ \ \ \space 94}$

This is a subtraction problem because we want to know how much longer the dog is compared to the cat, or the difference in their length. 

$\displaystyle \frac{\begin{array}[b]{r}97\\ -\ 53\end{array}}{ \ \ \ \space 44}$

This is a subtraction problem because we want to know how much longer the plate is compared to the bowl, or the difference in their length. 

$\displaystyle \frac{\begin{array}[b]{r}56\\ -\ 32\end{array}}{ \ \ \ \space 24}$

This is a subtraction problem because we want to know how much taller the tree is compared to the swing set, or the difference in their height. 

$\displaystyle \frac{\begin{array}[b]{r}98\\ -\ 87\end{array}}{ \ \ \ \space 11}$

This is a subtraction problem because we want to know how much longer the TV is compared to the remote, or the difference in their length. 

$\displaystyle \frac{\begin{array}[b]{r}78\\ -\ 18\end{array}}{ \ \ \ \space 60}$

This is a subtraction problem because we want to know how much longer the dog's body is compared to his tail, or the difference in their length. 

$\displaystyle \frac{\begin{array}[b]{r}92\\ -\ 74\end{array}}{ \ \ \ \space 18}$