Copy and complete this addition table. And, add four answers inside the addition table.

$+$	$-5$	$7$
$4$
$-3$

 

Copy and complete this addition table. And, add four integers on the side and the top of the addition table.

Copy and complete this addition table.

And, (i) Add four answers inside the addition table.

(ii) Add four integers on the side and the top of the addition table.

What do you notice about the answers of the above two.

Is this true for any addition table? Give evidence to justify your answer.

Three integers are equally spaced on a number line. Two of the integers are $-3$ and $7$. What is the other integer? Is there more than one possible answer?