1 turn clockwise is 12 hours, and turn 4 is 48 hours. The minute hand turns 1 hour, so 48× 1 = 48 times. If a clock is divided into 12, the hour hand turns 1 and the minute hand turns 12.

Basic method:

1, grid method: divide the circumference of the clock face into 60 grids evenly, and each grid is called 1 grid. The minute hand walks for 60 minutes every hour, which is a week; The hour hand only moves for 5 minutes, so the minute hand moves 1 minute, and the hour hand moves112 minutes.

2. Degree method: from the angle, the circumference of the clock face is 360 degrees, the minute hand rotates 360/60 degrees per minute, that is, 6 degrees, and the hour hand rotates 360 degrees per minute, (60x 12) degrees, that is,12 degrees.

Extended data

A clock has an hour hand and a minute hand. If the minute hand turns 360 degrees every hour and the hour hand turns 360 degrees every 12 hours, how many times will the hour hand and the minute hand form a right angle in 24 hours?

Analysis: Within 24 hours, the hour hand ran 2 laps, the minute hand ran 24 laps, and the minute hand ran 22 laps more than the hour hand, which is equivalent to two hands running. Then the minute hand catches up with the hour hand 22 times, which means it overlaps 22 times. Every overlap is vertical twice, so a * * * is vertical 44 times.

The minute hand and the hour hand should be vertical twice every hour and 48 times in 24 hours. Indeed, in most cases, the minute hand and the hour hand are indeed vertical twice an hour. But for example, in the two hours from 8:00- 10:00, the two needles were actually vertical only three times, not four times.