How many hours did Regina spend on her homework in all? Express the answer as a decimal.

Question

Regina spent 3 over 4, of an hour on her Math homework on Tuesday night. That evening, she also completed Spanish, History, and Biology homework. She spent twice as much time on her History homework as she did on her Math homework, 1 over 2, of an hour on Spanish homework, and 5 over 8, of an hour on Biology homework.

Answer 1

Let's convert all of the fractions of an hour into decimals and then add up all of the decimals.

 

math  = 3/4 hr = 0.75 hr

 

history = twice math = 2(0.75) = 1.50 hr

 

spanish = 1/2 = 0.50 hr

 

biology = 5/8 = 0.625 hr

 

So total time spent on homework is: 0.75 + 1.50 + 0.50 + 0.625 hours.  You can do the addition.