It’s 24 past 4 (Official clock system).

16:24

It’s 24 past 4.

Correct answer

16:23

It’s 23 past 4.

Error: 1 minute earlier

16:04

It’s 4 past 4.

Error: read minutes starting from hour markings and adding minutes

17:20

It’s 20 past 5.

Error: confuse hour and minute hands