It’s 18 past 4 (Official clock system).

16:18

It’s 18 past 4.

Correct answer

16:17

It’s 17 past 4.

Error: 1 minute earlier

16:06

It’s 6 past 4.

Error: read minutes starting from hour markings and adding minutes

16:20

It’s 20 past 4.

Error: confuse hour and minute hands