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Tutor: Alice

Summary

Units of time

​​In a nutshell

The units used on a daily basis are the second, minute and hour.  In order to consider time frames greater than this, use days, weeks, months and years.



Hours, minutes and seconds

Unit
Conversion
Example
Hours
11 hour = 6060 minutes​
School lessons typically last an hour
Minutes
11 minute = 6060 seconds​
Brushing your teeth should take two minutes
Seconds
-
A heartbeat lasts a second
​​


Example 1

How many seconds are in 22 hours and 33 minutes?

2 hours2 \text{ hours} = 2×602 \times 60 = 120 minutes120 \text{ minutes}

120+3=123 minutes120+3 = 123 \text{ minutes}

123×60=7380 seconds123 \times 60 = \underline{7380 \text{ seconds}}



Days, weeks, months and years

Days and weeks are constant units of time. Use the following equations to convert between units:

11 day = 2424 hours

11 week = 77 days


Unlike days and weeks, months and years can vary in how long they are:


Months
Duration (days)
January, March, May, July, August, October, December
3131​​
April, June, September, November
3030​​
February*
2828​​


*On leap years, February has 2929​ days instead. This means that leap years last 366366​ days, while non-leap years last 365365​ days.


Example 2

How many days are between March 18th18^{th} and September 2nd2^{nd}?


Calculate how many days are left in March:

3118=1331-18=13​​


Calculate how many days make up the months between March and September:

30+31+30+31+31=15330 + 31 + 30 + 31 + 31 = 153​​


Add the previous two values to the number of days in September: 

13+153+1=167 days13 + 153 + 1 = \underline{167 \text{ days}}


Note: As the question asked 'between', you do not need to include September 2nd.2^{nd}.


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Exercises

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FAQs - Frequently Asked Questions

Are years the longest unit of time?

When are leap years?

What unit should be used for time?

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