What time is it on each of these clocks?
Spot on - perfect :)
It's twenty-five past six. It's five past two. It's quarter past four.
very good and correct but here are a few other suggestions on how we would say it here.
It's six twenty five. Even tho "It's twenty-five past six" is correct not many people commonly use "past" but rather was just say the time by saying the hour then the minutes "It's six twenty five (6:25)". "It's four o five", "It's four fifteen".