Question

4 hours 30 minutes = ? Minutes

Answer 1

The answer is:  " 270 minutes " . 
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        →  There are "270 minutes" in "4 hours and 30 minutes" .
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Explanation:
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Method 1):
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  Note:  60 minutes = 1 hour (exactly); 

30 minutes =   ?   hr ? ; 

→  (30 minutes) * (1 hr/ 60 minutes) ;

= (30/60) hr = (3/6) hr  = (3÷3)/(6÷3) hr ;

= " $\frac{1}{2}$ hr " ;  

or; write as:  " 0.5 hr " .        
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So  "4 hours & 30 minutes" = 4 hours + 0.5 hours = 4.5 hours.

→   4.5 hours  =   ?  minutes ; 

The answer is:  " 270 minutes" .  4.5 hours * $\frac{60 min}{1 hr}$  ; 

       =  (4.5 * 60) minutes  =  " 270 minutes " .

→  The answer is:  " 270 minutes ".
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Method 2) 
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    "4 hours and 30 minutes"  =   ?   minutes " . 
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→  " 4 hours   =    ?   minutes " ; 

→   4 hr . * $\frac{60 min}{1 hr}$  =  (4 * 60) minutes  =  240 min. ; 

→  There are " 240 minutes in 4 hours" .

→  To find the number of "minutes" in "4 hours and 30 minutes" ;

→  we takes the number of minutes in 4 hours—which is "240 minutes"—and add "30 minutes" to that number; as follows:
   
           →  " 240 minutes + 30 minutes " ; 

to get:   " 270 minutes " . 
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      →  There are  "270 minutes"  in  "4 hours and 30 minutes" .
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The answer is:  " 270 minutes " . 
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