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Time conversions

We use the following rules for working out time conversions from one unit of measurement to another:

1 hour  =  60 minutes (represented as 1h = 60 min)

1 minute  =  60 seconds (represented as 1 min = 60 sec)

 

Let’s now look at some examples of time conversions:

Example 1: Convert 3 minutes to seconds

3 minutes = 3 x 60 seconds  =  180 seconds

 

Example 2: Convert 3 hours and 15 minutes to minutes

=  3 x 60  +  15

=  180 + 15

=  195 minutes

 

Example 3: Convert 3 days to hours

=  3 x 24  =  72 hours

 

Example 4: Convert 31/4 days to hours

=  3 x 24  +  1/4 x 24

=  72 + 6

=  78 hours

 

Example 5: Convert 21/2 hours to minutes

=  21/2 x 60

=  2 x 60  +  1/2 x 60

=  120 + 30

=  150 minutes

 

Example 6: Convert 21/2 hours to seconds

=  21/2 x 60 x 60

=  2.5 x 60 x 60

=  9000 seconds

 

Remember 1 h = 60 x 60  =  3600 seconds

 

Let’s now look at converting from analog time to digital time, and vice versa.

  • 20 past 5 in the morning  =  5:20 am
  • 40 past 6 in the evening (or 40 past 6 in the afternoon)  =  6:40 pm
  • Quarter to 6 am  =  5:45 am
  • 6:04 am  =  4 past 6 in the morning
  • 17:36  =  36 past 5 pm (because 17 – 12 = 5 pm)