Complete the addition-subtraction box:
(a) We have,
+ 
= 
= 
= 2
= 1
= 
= 
= 1
Therefore,
The above given number box can be completed as:
|
| 2 |
|
| 1 |
|
| 1 |
(b) We have,
= 
= 
= 
= 
= 
= 
= 
= 
= 
= 
= 
= 
Also,
= 
= 
= 
= 
Therefore, the above given table can be completed as follows:
|
|
|
|
|
|
|
|
|
11