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### Course: Middle school math (India)>Unit 1

Lesson 10: Week 10

# Telling time (labeled clock)

Learn about how to tell time using an analog clock. It covers identifying the hour and minute hands, understanding the concept of hours and minutes, and reading the clock to determine the time. See multiple examples to demonstrate the process of telling time. Created by Sal Khan.

## Want to join the conversation?

• Why do we have different time lines all over the world?
• The world is round, which means the sun cannot hit all points of the Earth at the same time. When it might be day for you, it is night for somebody on the other side of the Earth, because the sun is unable to reach that point on the planet. Times are adjusted according to where the sun is currently able to light the Earth.
• Why does the 12 on the clock mean and zero minutes?
• Because the shows that the 60 minute cycle is complete and it begins again
• In parallel universe, could there be 100 minutes in an hour instead of 60?
• Certainly, and we could have it in our universe too. For example the french attempted that with French Revolutionary Time.

Copied from Wikipedia: " French Revolutionary Time divided the day into 10 decimal hours, each decimal hour into 100 decimal minutes and each decimal minute into 100 decimal seconds"

They were not the only ones. There have been many such examples throughout history.
• Why does the analog clock have hands but digital clock have no hands.
• Analog clocks use moving hands pointing at fixed numbers to represent hours and minutes in a 12-hour format. Digital clocks show minutes and hours as moving numbers and so no hands are needed to point the numbers out. Digital clocks can also show time in 24-hour format.
• Why do you have to put like for an example why do you need to put a 0 before the five? Could you just do ?
• If you put , you mean: two hours and FIFTY minutes
If you put , you mean: two hours and FIVE minutes

50 isn't the same thing of 5, so you couldn't
• Is there a reason for the one that goes around faster then the other ones?
• The smaller one counts the hours and there are 24 hours in a day, 12 hours around a clock. So the small hand goes around the clock only two times each day. The bigger hand counts the minutes. There are 60 minutes in each hour. The big hand goes around the clock once each hour, so it goes around the clock 24 times each day. If you have a clock with a second hand, then it can actually become fun to watch the clock. There are 60 seconds in each minute. The second hand can be long, but it will be very skinny. It will move constantly. I love to sit and watch the seconds go by! It will go around the clock 60 times every hour and 1,440 times a day!
• How do you tell time on a sundial?
• it's like a normal clock face but there is a stick in the middle so that a shadow is cast by the sun as the stick works as an hour hand
• Why is midnight called midnight if its the begging of the day?
• Because it happens toward the middle of the night