Statement: $\left(-75\right)+18=$?

What do you observe? Is the sum of two integers always an integer?

Statement: $19+\left(-25\right)=-6$. 

What do you observe? Is the sum of two integers always an integer?

Statement:$27+\left(-27\right)=$?

What do you observe? Is the sum of two integers always an integer?

Statement:$\left(-20\right)+0=$?

What do you observe? Is the sum of two integers always an integer?

Statement:$\left(-35\right)+\left(-10\right)=$?

What do you observe? Is the sum of two integers always an integer?

Statement: $7-9=-2$.

What do you observe? Is there any pair of integers whose difference is not an integer? Can we say integers are closed under subtraction? Do the whole numbers satisfy this property?

Statement:$17-\left(-21\right)=$? 

What do you observe? Is there any pair of integers whose difference is not an integer? Can we say integers are closed under subtraction? Do the whole numbers satisfy this property?

Statement:$\left(-8\right)-\left(-24\right)=16$.

What do you observe? Is there any pair of integers whose difference is not an integer? Can we say integers are closed under subtraction? Do the whole numbers satisfy this property?

Statement: $\left(-21\right)-\left(10\right)=$? 

What do you observe? Is there any pair of integers whose difference is not an integer? Can we say integers are closed under subtraction? Do the whole numbers satisfy this property?