What happens when we subtract an interger from another integer ? Can we say that the difference is also an integer ? Observe the following table and complete it .
`"Statement" " " "Observation"`
(i) `7-9=-2 " " "Result is an interger"`
(ii) `17-(-21)=....... " " ...............`
(iii) `(-8)-(-14)=6 " " "Result is an integer"`.
(iv) `(-21)-(-10)=...... " " ..............`
(v) `32 -(-17)=..... " " ............`
(vi) `(-18)-(-18)=.... " "...............`
(vii) `(-29)-0=...... " " ...............`
What do you observe ? Is there any pair of integer whose difference is not an integer ? Can we say integers are close under subtraction ?