It’s 21 past 10 (Official clock system).

10:21

It’s 21 past 10.

Correct answer

10:22

It’s 22 past 10.

Error: 1 minute later

10:05

It’s 5 past 10.

Error: read minutes starting from hour markings and adding minutes

04:50

It’s 10 to 5.

Error: confuse hour and minute hands