Units of Time

There are different units of time.

Second, minute, hour, day, week, month and year are the units of time.

These have the following relations between each:

60 seconds = 1 minute
         or
1 minute = 60 seconds


60 minutes = 1 hour
         or
1 hour = 60 minutes

24 hours = 1 day (day + night)

7 days = 1 week

12 months = 1 year

52 weeks = 1 year

365 days or 366 days make a year

10 years make a decade

50 years make half century

100 years make a century


These are the relations between units of time.

So far we have studied the clocks having two hands – an hour hand and a minute hand. Some clocks and watches have a thin and long hand which moves faster than the other two hands called the second hand.

The second hand moves round the clock face in one minute. That is, it covers 60 small divisions in one minute. The time taken by it to move from one small division to the next is one second.

Thus, 60 seconds = 1 minute

Note: Minutes and seconds are symbolically represented with a single and double strokes at the top right of the numbers.

20 minutes = 20’, 20 seconds = 20”

Related Concepts

● Units for Measuring Length

● Measuring Instruments

● To Measure the Length of a Line-segment

● Perimeter of a Figure

● Unit of Mass or Weight

● Examples on Unit of Mass or Weight

● Units for The Measurement of Capacity

● Examples on Measurement of Capacity

● Measurement of Time

● Read a Watch or a Clock

● Antemeridian (a.m.) or Postmeridian (p.m.)

● What Time it is?

● Time in Hours and Minutes

● 24 Hour Clock

● Units of Time

● Examples Units of Time

● Time Duration

● Calendar

● Reading and Interpreting a Calendar

● Calendar Guides us to Know

4th Grade Math Activities

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