The clock problem can be regarded as a special problem that two people catch up or meet on a circular orbit, but the two people here are the minute hand and the hour hand of the clock respectively. The clock problem is different from other travel problems because the measurement of speed and total distance is no longer one meter per second or one kilometer per hour, but "how many angles are walked per minute" or "how many squares are walked per minute" by two hands.

But in many clock problems, we often encounter all kinds of "strange clocks", and the degrees of the hour hand and the minute hand will be different from those of the conventional clock, so we need to learn to analyze different problems independently. We should regard the clock problem as a stroke problem, because the minute hand is fast and the hour hand is slow, so the problem between the minute hand and the hour hand is the problem of catching up. In addition, in solving the problem of clock speed, we should learn the cross method.

Related knowledge:

When the hour hand is between two numbers, it is a few minutes later, a few minutes when the minute hand points, and a few minutes when the minute hand is between a few minutes and a few minutes. Tell children what time to get up, sleep and eat every day, and let them have a clearer understanding of time with props.

The understanding of clocks and watches is also a gradual process. For children who are too young, don't encourage them to have a general understanding of time, such as how long 1 minute, what 1 minute can do, how long 1 hour can do, and how much 1 hour can do.

Baidu Encyclopedia-Clock