Practice with the help of Spectrum Math Grade 5 Answer Key Chapter 8 Lesson 8.9 Elapsed Time regularly and improve your accuracy in solving questions.
Spectrum Math Grade 5 Chapter 8 Lesson 8.9 Elapsed Time Answers Key
To calculate the amount of time that has elapsed, follow these steps:
- Count the number of whole hours between the starting time and finishing time.
- Count the remaining minutes.
- Add the hours and minutes.
For example: start time: 9:39 a.m.
finish time: 4:16 p.m.
From 9:39 a.m. to 3:39 p.m., count 6 hours.
From 3:39 p.m. to 4:16 p.m., count 37 minutes.
The total time elapsed is 6 hours and 37 minutes.
Determine how much time has elapsed in each problem.
Question 1.
a.
Time elapsed: ___________ hours __________ minutes.
Answer:
Time elapsed: 2 hours 38 minutes.
Explanation:
Given,
start time: 8:26 a.m.
finish time: 11:04 a.m.
To calculate the amount of time that has elapsed,
First, count the number of whole hours between the starting time and finishing time.
from 8:26 a.m. to 10:26 a.m. = 2 hours.
Next, count the remaining minutes.
from 10:26 a.m. to 11:04 a.m. = 38 minutes.
Finally, Add the hours and minutes.
So, The total time elapsed is 2 hours and 38 minutes.
b.
Time elapsed: ___________ hours __________ minutes
Answer:
Time elapsed: 10 hours 33 minutes.
Explanation:
Given,
start time: 5:56 a.m.
finish time: 4:29 p.m.
To calculate the amount of time that has elapsed,
First, count the number of whole hours between the starting time and finishing time.
from 5:56 a.m. to 3:56 p.m. = 10 hours.
Next, count the remaining minutes.
from 3:56 p.m. to 4:29 p.m. = 33 minutes.
Finally, Add the hours and minutes.
So, The total time elapsed is 10 hours and 33 minutes.
Question 2.
a.
Time elapsed: ___________ hours __________ minutes
Answer:
Time elapsed: 7 hours 5 minutes.
Explanation:
Given,
Arrival time: 6:12 p.m.
Departure time: 1:17 a.m.
To calculate the amount of time that has elapsed,
First, count the number of whole hours between the starting time and finishing time.
Arrival time: 6:12 p.m. to Departure time: 1:17 a.m. = 7 hours.
Next, count the remaining minutes.
from 1:12 a.m. to 1:17 a.m. = 5 minutes.
Finally, Add the hours and minutes.
So, The total time elapsed is 7 hours and 5 minutes.
b.
Time elapsed: ___________ hours __________ minutes
Answer:
Time elapsed: 6 hours 24 minutes.
Explanation:
Given,
Departure time: 2:57 p.m.
Arrival time: 9:21 a.m.
To calculate the amount of time that has elapsed,
First, count the number of whole hours between the starting time and finishing time.
from 2:57 p.m. to 8:57 a.m. = 6 hours.
Next, count the remaining minutes.
from 8:57 a.m. to 9:21 a.m. = 24 minutes.
Finally, Add the hours and minutes.
So, The total time elapsed is 6 hours and 24 minutes.
Question 3.
a.
Time start: ____________ a.m.
Time finish: ___________ a.m.
Time elapsed: ____________
Answer:
Time start: 12:15 a.m.
Time finish: 2:51 a.m.
Time elapsed: 2 hr.36 min.
Explanation:
From the above given clocks,
we observe that the short hand or hours hand is on 12 and minutes hand or long hand is on 3.
So, the starting time is 12:15 a.m.
In the second clock,
the short hand or hours hand is on 2 and minutes hand or long hand is between 10 and 11.
So, the finish time is 2:51 a.m.
The time elapsed between two clocks,
First, count the number of whole hours between the starting time and finishing time.
from 12:15 a.m. to 1:15 a.m. = 2 hours.
Next, count the remaining minutes.
from 1:15 a.m. to 2:51 a.m. = 36 minutes.
Finally, Add the hours and minutes.
So, The total time elapsed is 2 hours and 36 minutes.
b.
Time start: ____________ a.m.
Time finish: ___________ a.m.
Time elapsed: ____________
Answer:
Time start: 3:37 a.m.
Time finish: 10:35 a.m.
Time elapsed: 6 hr.58 min.
Explanation:
From the above given clocks,
the short hand or hours hand is on 3 and minutes hand or long hand is between 7 and 8.
So, the starting time is 3:37 a.m.
In the second clock,
the short hand or hours hand is on 2 and minutes hand or long hand on 7.
So, the finish time is 10:35 a.m.
The time elapsed between two clocks,
First, count the number of whole hours between the starting time and finishing time.
from 3:37 a.m. to 9:37 a.m. = 6 hours.
Next, count the remaining minutes.
from 9:37 a.m. to 10:35 a.m. = 58 minutes.
Finally, Add the hours and minutes.
So, The total time elapsed is 6 hours and 58 minutes.