-3/4-1/2

I get -1/4 but my dad is saying -1 1/4. Can you please help with the answer and explain how you came up with it? Thank you

well, what is 3/4 + 1/2?

What you have is -(3/4 + 1/2)

1/2 - 3/4 is in fact -1/4.
-(3/4 - 1/2) is -1/4

Hate to say it, but old Dad is right again.
Start off with a negative value, and subtract even more from it, and it gets more negative, not less negative.

Plot -3/4 on the number line.
Then move to left another 1/2. You wind up at -5/4 = -1 1/4.