Divide 45 by 8 gives you 5 and 5/8
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45/12 = 15/4 = 3 3/4
By writing the 45 minutes as a fraction of an hour. One hour is 60 minutes, so write the 45 over 60 and simplify.
22.5 or 22 and 1/2 is half of 45
So 45 minutes is 3/4 of an hour (60 minutes in an hour, 45/60 simplifies to 3/4). That means the mixed number would be 2 3/4 hours.
To make a percentage a faction put it over 100 and simplify: 405 % = 405/100 = 45/100 = 41/20