Theory:

Important!
\(1\) minute \(=\) \(60\) seconds
 
\(1\) hour \(=\) \(60\) minutes
 
\(1\) day \(=\) \(24\) hours
Steps to convert hours to seconds:
Step 1: Let us first convert hours to minutes.
 
Step 2: Then, convert minutes to seconds.
Example:
1. Convert \(1\) hour to seconds.
 
Solution:
 
\(1\) hour \(=\) \(60\) minutes
 
\(=\) \(60\) \(\times\) \(1\) minute
 
\(=\) \(60\) \(\times\) \(60\) seconds    [Since \(1\) minute \(=\) \(60\) seconds]
 
\(=\) \(3600\) seconds
 
Therefore, \(1\) hour \(=\) \(3600\) seconds.
 
 
2. Convert \(7266\) seconds to hours.
 
Solution:
 
Let us do the above procedure in reverse.
 
First convert seconds to minutes.
 
\(60\) seconds \(=\) \(1\) minute
 
\(1\) second \(=\) 160 minute
 
\(7266\) seconds \(=\) 726660 minutes
 
Now, convert minutes to hours.
 
\(60\) minutes \(=\) \(1\) hour
 
\(1\) minute \(=\) 160 hour
 
726660 minutes \(=\) 726660×60=72663600 hour
 
236007266720066¯¯
 
\(7266\) seconds \(=\) \(2\) hours \(+\) \(66\) seconds
 
\(=\) \(2\) hours \(+\) \(60\) seconds \(+\) \(6\) seconds
 
\(=\) \(2\) hours \(+\) \(1\) minute \(+\) \(6\) seconds
 
Therefore, \(7266\) seconds \(=\) \(2\) hours \(1\) minute \(6\) seconds.
Steps to convert day to seconds:
Step 1: Let us first convert day to hours.
 
Step 2: Now, convert hours to minutes.
 
Step 3: Finally, convert minutes to seconds.
Example:
1. Convert \(1\) day to seconds.
 
Solution:
 
\(1\) day \(=\) \(24\) hours
 
\(=\) \(24\) \(\times\) \(1\) hour
 
\(=\) \(24\) \(\times\) \(60\) minutes    [Since \(1\) hour\(=\) \(60\) minutes]
 
\(=\) \(1440\) minutes
 
\(=\) \(1440\) \(\times\) \(60\) seconds
 
\(=\) \(86400\) seconds
 
Therefore, \(1\) day \(=\) \(86400\) seconds.
Important!
Do multiplication to convert larger unit to smaller unit.
 
Do division to convert smaller unit to larger unit.