MathIsimple
Lesson 4-4: Time Calculations

Time Calculations (Across Hours)

Master time calculations across hours, including elapsed time and time word problems through interactive activities.

45 minutesTime CalculationsSchool DayReal-World Applications
Learning Scenario: School Day Schedule

The Challenge:

Your school day starts at 8:00 AM and ends at 3:00 PM. You have lunch from 12:00 PM to 1:00 PM. How many hours is your total school day? How long is your lunch break?

School Day Challenge

Time Calculation:

School day: 8:00 AM to 3:00 PM = 7 hours
Lunch break: 12:00 PM to 1:00 PM = 1 hour
Class time: 7 hours - 1 hour = 6 hours
Check: 8:00 AM + 7 hours = 3:00 PM ✓

Learning Activities

Master time calculations through interactive activities and real-world scenarios

Knowledge Points Display
Activity 1
Learn time calculations with our friendly math teacher. Master elapsed time through interactive demonstrations.

Key Features:

  • Interactive clock models
  • Step-by-step time calculation process
  • Visual time strategies
  • Progress tracking with milestones

Skills You'll Learn:

  • Calculate elapsed time across hours
  • Solve time word problems
  • Read analog and digital clocks
  • Estimate time durations
Interactive Practice
Activity 2
Practice time calculations through school day scenarios. Learn to calculate elapsed time and solve time problems.

Key Features:

  • School day simulation
  • Interactive time calculation
  • Visual clock guidance
  • Real-world applications

Skills You'll Learn:

  • School starts at 8:00 AM, ends at 3:00 PM
  • Lunch is 12:00 PM to 1:00 PM
  • Recess is 10:30 AM to 10:45 AM
  • Use virtual clocks to calculate time
Examples Library
Activity 3
Explore various time calculation examples with different strategies and practice problems.

Key Features:

  • Multiple time problem types
  • Different calculation strategies
  • Step-by-step solutions
  • Interactive practice problems

Examples:

  • 8:00 AM to 3:00 PM = 7 hours
  • 10:30 AM to 2:45 PM = 4 hours 15 minutes
  • 9:15 AM to 11:30 AM = 2 hours 15 minutes
  • 1:00 PM to 4:30 PM = 3 hours 30 minutes
Time Calculation Guide

Elapsed Time Steps:

Step 1: Find start time

Identify when the event begins

Step 2: Find end time

Identify when the event ends

Step 3: Calculate difference

Subtract start time from end time

Step 4: Check your work

Add elapsed time to start time

Time Examples:

Same hour

9:15 AM to 9:45 AM = 30 minutes

Across hours

10:30 AM to 2:15 PM = 3 hours 45 minutes

Across days

8:00 PM to 6:00 AM = 10 hours

Use number line

Visual tool to calculate elapsed time

Practice Examples

School Day Problems:

8:00 AM to 3:00 PM = 7 hours

12:00 PM to 1:00 PM = 1 hour

10:30 AM to 10:45 AM = 15 minutes

9:00 AM to 11:30 AM = 2 hours 30 minutes

Time Calculations:

10:30 AM to 2:45 PM = 4 hours 15 minutes

9:15 AM to 11:30 AM = 2 hours 15 minutes

1:00 PM to 4:30 PM = 3 hours 30 minutes

Check: Start + Elapsed = End

Ready for the next unit?

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