A movie was 3 1/2 hours long. If Lily turned the movie off 1/4 of the way through, how much time did she spend watching it?

330 minutes watched

330 : 4 = 82.5 mins

1 hour 22minuites and 30 seconds spent watching

7/8 of an hour

Step-by-step explanation:

We multiply the total of the movie, 3 1/2 hours, by the fraction she watched, 1/4:

1/4 (3 1/2)

To multiply these, we convert the mixed number to an improper fraction. We multiply the whole number, 3, by the denominator, 2; this gives us 6. We add the numerator, 1; this gives us 7. This makes it 7/2:

1/4 (7/2)

To multiply fractions, we multiply straight across:

(1*7) / (4*2) = 7/8