Elapsed Time — Answer Key
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
A Grade 4 reading session lasted 3 hours and 20 minutes, which equals 180 minutes total.
Corrected: A Grade 4 reading session lasted 3 hours and 20 minutes, which equals 200 minutes total.
3 hours times 60 minutes equals 180 minutes; adding 20 more gives 200 minutes.
2. Fix the sentence:
A schedule duration of 150 minutes converts to 1 hour and 30 minutes.
Corrected: A schedule duration of 150 minutes converts to 2 hours and 30 minutes.
150 divided by 60 is 2 with a remainder of 30, so it equals 2 hours 30 minutes.
3. Fix the sentence:
An itinerary stop lasting 90 minutes is the same as 1 hour and 20 minutes long.
Corrected: An itinerary stop lasting 90 minutes is the same as 1 hour and 30 minutes long.
90 minus 60 equals 30, so 90 minutes is 1 hour 30 minutes.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. A Grade 4 schedule duration of 3 hours and 20 minutes equals 200 minutes total.
3 times 60 equals 180, and 180 plus 20 equals 200 minutes.
2. An itinerary leg of 150 minutes converts to 2 hours and 30 minutes.
2 hours equals 120 minutes; 150 minus 120 leaves 30 minutes.
3. A Grade 4 movie night duration of 2 hours and 45 minutes equals 165 minutes.
2 times 60 equals 120, and 120 plus 45 equals 165 minutes.
4. A travel itinerary segment of 100 minutes is the same as 1 hour and 40 minutes.
100 minus 60 equals 40, so the duration is 1 hour 40 minutes.
Part C: Short Answer
Answer each question in one or two complete sentences.
1. A Grade 4 family schedule shows a museum visit lasting 2 hours and 15 minutes. How many minutes is that, and how do you convert it?
Sample answer: Multiply 2 by 60 to get 120 minutes, then add 15 minutes for a total duration of 135 minutes.
2 hours equals 120 minutes; 120 plus 15 equals 135 minutes.
2. An itinerary lists a duration of 195 minutes for a road trip leg. Convert this to hours and minutes.
Sample answer: 195 divided by 60 is 3 with a remainder of 15, so the duration is 3 hours and 15 minutes.
3 hours equals 180 minutes; 195 minus 180 leaves 15 minutes.