The minute hand lands on any of the sixty marks, not just the twelve numbers, so a student cannot count round in fives - they have to read the nearest number and then count on. This is the last step in telling time, and the one that needs the most practice.
The hour hand matters here too: at 3:58 it is almost touching the 4, and a student who reads it as 4 has the hour wrong by an hour. Twelve clocks to a page; drop to nine or six to make them larger.
Third grade in most curricula, after telling time to five minutes is comfortable.
The minute hand no longer points at a number you can name directly. You read the nearest number, then count the extra marks - and you have to watch the hour hand, which by now is sitting very close to the next hour.
On the five-minute page every time ends in 00, 05, 10 and so on. Here a time can be 7:23 or 11:48, so the minute hand sits between the numbers.
Turn on Include Answer Pages and a key prints behind each page with the digital time for every clock.