# McGraw Hill My Math Grade 3 Chapter 11 Lesson 6 Answer Key Time Intervals

All the solutions provided inÂ McGraw Hill My Math Grade 3 Answer Key PDF Chapter 11 Lesson 6 Time Intervals will give you a clear idea of the concepts.

## McGraw-Hill My Math Grade 3 Answer Key Chapter 11 Lesson 6 Time Intervals

To determine a time interval, find the amount of time that passes from the start of an activity to the end of an activity.

Math in My World

Example 1

Evan’s mother put biscuits in the oven at 5:10 P.M. She took them out of the oven at 5:27 P.M. HOW much time passed from the time she put the biscuits in the oven to the time she took them out?

Find the time interval from 5:10 to 5:27.

1. Find the start time. The start time is ____________ P.M.

2. Find the end time. The end time is ______________ P.M.

3. Count by 5s from 5:10 to 5:25.

4. Count on by ones from 5:25 to 5:27.

So, _____________ minutes passed from 5:10 P.M. to 5:27 P.M.
The time interval was ____________ minutes.
The start time is 5:10 P.M.
The end time is 5:27 P.M.
The count by 5s from 5:10 to 5:25 is 15 mins
Count by 1s from 5:25 to 5:27 is 2 mins
15 + 2 = 17 mins
So, 17 minutes passed from 5:10 P.M. to 5:27 P.M.
The time interval was 17 minutes.

Example 2

The clock shows the time Juneâ€™s choir practice ended Âˇn the afternoon. If it was 135 minutes long, what time did it start?

Count back 135 minutes from 3:15 P.M. Use the number line.

The time interval for choir practice was _____________ minutes, or ____________ hours and ___________ minutes.
135 minutes before 3:15 P.M. is _____________ P.M.
Choir practice started at ______________ P.M.
3 hour 15 mins – 135 mins
1 hour = 60 mins
135 mins = 2 hour 15 mins
3 hour 15 mins – 2 hour 15 mins = 1 hour
Choir practice started at 1 P.M.

Talk Math

Lupe took a nap at the time shown and woke up at 1:30 P.M. Explain how you can find how long he slept.

Lupe took a nap at the time shown and woke up at 1:30 P.M.
1:30 – 12:15 = 1 hour 15 mins
Thus he slept for 1 hour 15 mins.

Guided Practice

Question 1.
Find the time interval of a movie. Use the number line.

____________ minutes + _____________ minutes = _____________ minutes, or
__________ hour and ____________ minutes.
60 minutes + 30 minutes = 90 minutes or 1 hour and 30 minutes
So, the time interval is 1 hour 30 minutes

Independent Practice

The following are times of baseball games. Find the time interval for each.

Question 2.
Start Time (P.M.) End Time (P.M.)

60 minutes + 45 minutes + 7 minutes = 112 minutes
So, the time interval is 112 minutes or 1 hour 52 minutes

Question 3.

_____________ minutes
The start time is 12:15 p.m.
The end time is 2:28 pm.
2:28 – 12:15 = 2 hour 13 minutes
So, the time interval is 2 hour 13 minutes

Question 4.

_____________ minutes
The start time is 1:20 p.m.
The end time is 5:05 p.m.
5:05 – 1:20
4 hour 65 min
-1 hour 20 minute
3 hour 45 min
So, the time interval is 3 hour 45 minutes

Write the time. Then draw the hands on the clock to show the time interval.

Question 5.

The start time is 11:55 a.m.
35 minutes earlier is 11:55 – 35 min = 11:20

Question 6.

The start time is 10:30 p.m.
36 minutes earlier is 10 hour 30 min + 36 min = 10 hour 66 min = 11:06 p.m.

Problem Solving

Question 7.
Tyrone started mowing lawns at 1:10 P.M. He finished mowing at 4:05 P.M. HOW much time did Tyrone spend mowing lawns?
Given,
Tyrone started mowing lawns at 1:10 P.M.
He finished mowing at 4:05 P.M.
4 hour 5 min
-1 hour 10 min
2 hour 55 min
Thus Tyrone spends 2 hour 55 mins mowing lawns.

Question 8.
It takes Louisa one hour and 30 minutes to get to her aunt’s house. She leaves at 4:00 P.M. Draw the hands on the clock to show the time she will get to her aunt’s house. Then write the time.

Given,
It takes Louisa one hour and 30 minutes to get to her aunt’s house. She leaves at 4:00 P.M.
4 hour + 1 hour 30 mins = 5 hour 30 mins

HOT Problems

Question 9.
Mathematical PRACTICE Reason How do the units of time, such as minutes and hours, relate to each other?
The relationship between minutes and hours are
1 hour = 60 minutes

Question 10.
Mathematical PRACTICE Which One Doesn’t Belong? Circle the set of digital clocks that does not show a time interval of 85 minutes. Explain.

Set B and C does not belong to the time interval of 85 minutes.

Question 11.
Building on the Essential Question How can I determine the duration of time intervals in hours?
Answer: The time interval is the difference between the two given points in the time.

### McGraw Hill My Math Grade 3 Chapter 11 Lesson 6 My Homework Answer Key

Practice

The following are times of parades. Find the time interval for each.

Question 1.

60 minutes + 60 minutes + 18 minutes = 138 minutes

Question 2.

____________ minutes
The start time is 2:15 p.m.
The end time is 4:05 p.m.
The time interval is 3 hour 65 min – 2 hour 15 mins = 1 hour 50 mins

Question 3.

_____________ minutes
The start time is 9:00 a.m.
The end time is 11:37 a.m.
The time interval is 2 hour 37 minutes

Write the time. Then draw the hands on the clock to show the time interval.

Question 4.

The starting time is 4:45 P.M.
50 minutes earlier is 3:55 P.M.

Question 5.

The time is 9:10 A.M.
27 minutes later is 9:37 A.M.

Problem Solving

Question 6.
It took Henry 2 hours and 17 minutes to write his report. He started writing at 3:30 P.M. What time did he finish his report?
Given,
It took Henry 2 hours and 17 minutes to write his report. He started writing at 3:30 P.M.
3 hour 30 min
+2 hour 17 min
5 hour 47 min
Thus he finishes his report at 5:17 P.M.

Question 7.
Mathematical PRACTICE Plan Your Solution Melanie started working in her garden at 8:25 A.M. She took a break at 11:10 A.M. How many minutes did Melanie work before taking a break?
Given,
Melanie started working in her garden at 8:25 A.M. She took a break at 11:10 A.M.
11 hour 10 minutes – 8 hour 25 minutes

10 hour 70 minutes
-8 hour 25 minutes
2 hour 45 minutes
Melanie work 2 hour 45 mins before taking a break.

Vocabulary Check

Question 8.
Write a definition for a time interval.
The definition of a time interval is a length of time can be divided into a number of shorter periods of time, all of the same length.

Test Practice

Question 9.
It takes Wallace 50 minutes to do the grocery shopping. If he starts at 2:12 P.M. what time will he finish?
(A) 2:42 P.M.
(B) 2:52 P.M.
(C) 3:02 P.M.
(D) 3:07 P.M.