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how many min. in 9 hrs and 12 min

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2 Answers

Hi Samira,

1. Start by writing out your terms with their units (labels)

9 hours + 12 minutes = ______ minutes

2. Then write down the outside info you need

60 minutes = 1 hour

3. Multiply the hour by minutes per hour to convert the hours into minutes

9 hours x 60 minutes/hour + 12 minutes

The hours cancel out, leaving that term in minutes ( 9 x 60 minutes = 540 minutes)

4. Now you have 540 minutes + 12 minutes = 552 minutes


In case you have more math problems like these to solve, you can search for info on "dimensional analysis" (sometimes called unit-factor or factor-label problems). You might see these in science class (like converting liters to pints) or word problems involving money. You can solve all of those types of problems with this same approach!

Please "vote up" the answer if you found it helpful :)


There are 60min/hr. Thus 9hr * 60min/hr will yield the number of min in 9 hours. Then you just need to add the 12 extra minutes.