Noon Navigators Facilitation Guide Noon Navigators
Teacher Facilitation Guide
4th Grade Math
Learning Objective
Students will distinguish between AM and PM and calculate time duration across the noon boundary using the "bridging to the hour" strategy on a number line.
Timing
40-45 Minutes
Materials Needed
Noon Navigator Slides
Lunchtime Logistics Worksheet
Pencils & Highlighters
Instructional Procedure
5m
Warm-up: The Noon Flip
Discuss the difference between AM and PM. Focus on the 12:00 transition.
Prompt: "If it is 11:59 AM, what happens in just one minute?"
Discussion: Clarify that 12:00 PM is Noon. Many students mistake 12:00 PM for midnight because "PM" usually feels like night.
10m
Video Case Study: Hallie & Blake
Watch the Matholia duration video. Use the provided pause points.
0:18 (Hallie): Ask why the clock shows 3:35 and not 4:35 (hour hand placement).
0:36 (Strategy): Discuss "bridging." Why is 4:00 a "friendly" number? It's the goal line for our first jump.
1:14 (The Blake Challenge): Pause after the times (11:50 AM to 12:45 PM) are revealed. Have students draw a number line on their desk or scratch paper before continuing.
1:21 (The Flip): Emphasize that switching from AM to PM doesn't change how we count minutes, but it does change our "bridging point" to 12:00.
20m
Activity: Lunchtime Logistics
Students complete the worksheet calculating school day durations.
Students must use the Number Line Strategy for every problem.
Circulate and look for students who forget to label their jumps (e.g., "+10 min").
Key Check: Ensure they are bridging to 12:00 PM correctly.
Ext
The "Double Bridge" Challenge
Challenge students to calculate Blake's violin session if he played until 1:15 PM.
Logic: 11:50 AM $\rightarrow$ 12:00 PM (10 min) $\rightarrow$ 1:00 PM (60 min) $\rightarrow$ 1:15 PM (15 min). Total: 85 minutes (or 1 hr 25 min).
Vocabulary
Duration Bridging Ante Meridiem (AM) Post Meridiem (PM)
Noon Navigators Presentation Slides Noon Navigators
Mastering the AM to PM Jump
The Noon Flip
11:59 AM
Almost lunchtime...
12:00 PM
Noon!
• Does 12:00 PM mean it's nighttime?
• What is the very first minute of the afternoon?
Why does the label switch from AM to PM?
Case Study: Duration
Embedded media
Watch
The Clocks
Notice
The Number Line
Bridge
To the Hour
Pause at 0:18
Hallie's Start Time
3:35 PM
The hour hand is past the 3, but not yet at the 4.
"Why do we call this 3:35 and not 4:35?"
Pause at 1:14
The Blake Challenge
Start Time
11:50 AM
End Time
12:45 PM
!
Draw a number line on your paper.
?
What "Friendly Number" will you bridge to first?
(Solve before we press play!)
The "Bridge to Noon" Strategy
11:50 AM
12:00 PM
12:45 PM
Step 1
Jump to the Noon Bridge (12:00 PM).
Step 2
Jump from Noon to the Finish Line.
Lunchtime Logistics
Grab your worksheet! We're going to use our "Noon Navigator" skills to solve real school schedule problems.
Remember: Show your number line for every problem!
Lunchtime Logistics Worksheet Lunchtime Logistics
Calculating Duration Across Noon
Name:
Date:
Instructions: For each school activity, use the number line strategy to calculate how many minutes it lasts. Make sure to "bridge" to 12:00 PM (Noon) for every problem!
1. Morning Recess
Start
11:45 AM
End
12:15 PM
Duration:
minutes
2. Cafeteria Lunch
Start
11:55 AM
End
12:30 PM
Duration:
minutes
3. Library Time
Start
11:35 AM
End
12:20 PM
Duration:
minutes
Navigator Challenge
Blake was practicing his violin. He started at 11:50 AM , but he got so excited that he practiced until 1:15 PM ! How many minutes total did he practice?
Total Challenge Duration:
minutes
Bridged to 12:00?
Labeled Jumps?
Added Totals?
Lunchtime Logistics Answer Key Lunchtime Logistics
Answer Key & Teacher Guide
1. Morning Recess
Start
11:45 AM
End
12:15 PM
+15 min
+15 min
11:45 AM
12:00 PM
12:15 PM
Duration:
30
minutes
2. Cafeteria Lunch
Start
11:55 AM
End
12:30 PM
+5 min
+30 min
11:55 AM
12:00 PM
12:30 PM
Duration:
35
minutes
3. Library Time
Start
11:35 AM
End
12:20 PM
+25 min
+20 min
11:35 AM
12:00 PM
12:20 PM
Duration:
45
minutes
Challenge Solution
+10m
+60m
+15m
11:50 AM
12:00 PM
1:00 PM
1:15 PM
Total:
85
(or 1 hr 25 min)