Explanation and analysis: every second hand moves in one grid equals to 1 sec, and it takes 1 sec to move from the number 12 to the number 2. A big one takes 5 minutes, so it is 2 grids, and every second has 5 grids, each grid equals to1sec, so it takes/kloc-0.

It takes 60 minutes for the minute hand to walk once, each grid 1 minute, and the rotation angle is six degrees. Each number is five minutes and the rotation angle is 30 degrees.

When the hour hand rotates once on the clock, it is 12 hour, each square is 0.2 hour, and the rotation angle is six degrees. Take a number, which is 1 hour, and the rotation angle is 30 degrees.

Understand the clock face problem

1, the longest hand is called (second hand).

2, a little long needle is called (minute hand).

The shortest hand is called the hour hand.

4. How many numbers are there on a clock face (12)? The top number is 12, followed by 1, 2... 1 1.

5. Minute hand refers to the hand that moves in minutes on the clock. When the minute hand moves on the clock, it needs 1 minute, and the rotation angle is six degrees. When a number moves, it takes five minutes and the rotation angle is 30 degrees.