need help on a 3rd grade word problem

Debbie spends 45 minutes at the dentist. What part of an hour does she spend at the dentist?
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45/60=3/4. 45 minutes is 45 60ths of an hour because there are 60 minutes in an hour. 15 divides into top and bottom of 45/60 3 times and 4 times, hence 3/4.

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