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AKS: 4MA.D.6 measure time and objects that exist in the world to solve real-life, mathematical problems and analyze graphical displays of data to answer relevant questions (4.MDR.6).
Learning Target: I can solve problems involving elapsed time to the nearest minute.
Activating Strategy
Activating Strategy
Find a partner and stand back to back.
Show the image on the clock: “What time is this clock showing? How do you know?”
Remain back to back to think independently about the question while looking at the clock image.
When I ask, turn and face your partner and share your answer to the question with each other.
How can you think about which time interval does not belong?
What tools can you use to make sense of the different amounts of time?
How can you compare the different amounts of time?
Make a 4-square page in our math journals to answer Warm-Up questions using SLIDE 100.
Mini-Lesson
Mini-Lesson
We have learned about metric measurement units for mass, length, and liquid volume. You have also solved problems involving metric units.
Today, we will learn how to solve problems involving elapsed time to the nearest minute when the end time is unknown.
Maddie’s mom has a lot of morning activities to do before going to work. She wakes up at 6:45 AM. She drinks coffee for 15 minutes, exercises for 40 minutes, makes breakfast for 10 minutes, showers for 10 minutes, brushes her teeth, and gets dressed in 18 minutes. What time will Maddie’s mom be ready to leave for work?
In this problem, I know the start time, or the time Maddie’s mom woke up. I also know the time Maddie’s mom spent on her morning activities before leaving for work, so the end of time, or the time Maddie’s mom will be ready for work, is the unknown I am solving for.
I will use a clock and a two-column chart to help me figure out when Maddie’s mom will be ready for work after she does all her morning activities. I know that Maddie’s mom wakes up at 6:45 AM, and I know how long it takes her to do each activity, so I can use my clock and two-column table to help me find the time Maddie’s mom is ready to leave for work.
Let’s start by making 6:45 AM on my clock, and I will write the time on a two-column table. I will make 6:00 on my clock by placing the minute hand at the 12 and the hour hand at the 6. Then, I will count by five minutes until I reach 45 minutes. I see that at 6:45 AM, the minute hand points to the 9, the hour hand is between the 6 and the 7, and it is closer to the 7 because it is 15 minutes until 7 o’clock.
This is the time Maddie’s mom wakes up. Then, she drinks coffee for 15 minutes. I’ll move the minute hand 15 minutes and write the new time on my two-column table.
After adding all of the morning activity durations to the time Maddie’s mom wakes up, I see she will be ready to leave for work at 8:18 AM.
Watch a learning video:
Guided Practice
Guided Practice
Now, mathematicians, it’s your turn - Solve this problem with a math partner:
Jack wakes up at 5:50 AM to start getting ready for school. If it takes him 15 minutes to shower and get dressed, 5 minutes to brush his teeth, and 16 minutes to eat breakfast, what time will he be ready to leave for school?
A two-column table and an analog clock are great tools for organizing math thinking when solving elapsed time problems.
Practice in small groups - Complete together BEFORE your assigned rotation:
Independent Task
Independent Task
1. FRECKLE - Complete THREE Freckle Assignments each week. DUE FRIDAY. Your HIGHEST score in Targeted Practice is your weekly math grade - Click HERE for Freckle website
GRADED Targeted Practice - Current skill (5 questions; Score Goal=80% or higher)
Fact Practice - Multiplication Fact Practice
Adaptive Practice - At YOUR level
2. iREADY Math - Complete 30 minutes at your level each week
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