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Addition/Subtraction

Below is a calculator to help check your results and find an answer to a question:

Addition

Answer these questions then check them using the calculator!
a. 5 + 7
b. 22 + 12
c. 9 + 0 
d. 87 + 15
e. 19 + 104
f. 104 + 19

What is happening when you add these numbers together? 
Were the answers to question e and f the same or different?
Why/why not?

Subtraction

Answer these questions then check them using the calculator!
a. 5 - 7 
b. 22 - 12
c. 9 - 0
d. 87 - 15
e. 19 - 104

What is happening when you add these numbers together?
Why were the answers different to addition for subtraction? 
Were the answers to e and f the same or different this time?
Why/why not?