The Chuckle Brothers explain how to read the time on an analogue clock to the nearest 5 minutes ... numbers only divisible by 5 for the minute hand.

“Analogue clock reading and calendar comprehension involve intricate cognitive steps: they demand fine-grained visual ...

For example, when the clock shows the short hand on 3 and the long hand on 12, it is 3 o'clock. Reading the hours on a clock is like following a number line from 1 to 12. Each number shows an hour.