Grade 3/Subtraction
Time Interval Subtraction (Elapsed Time) (801)
Find elapsed time or remaining time using subtraction; no negative results.
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Teacher Resources
Teaching Notes
Model borrowing 1 hour → 60 minutes.
Vocabulary
Elapsed Time: The amount of time that has passed.
Borrowing Time: Regrouping hours into minutes.
Common Mistakes
- forgetting to regroup
- Incorrect regrouping of 60
- Subtracting minutes from hours
- Ignoring unit labels
- Miscalculating elapsed duration
Differentiation
SupportUse a number line or clock model.
ChallengeInclude multi-step word problems.
Discussion Questions
- When do we calculate elapsed time?
- How is time regrouping different from base ten?
- Describe a situation needing this skill.
- What strategies help avoid errors?
Extension Activities
- Use a clock face.
- Draw a timeline.
- Calculate time to the nearest hour.
Parent Tip
Ask: 'If we start at 2:00 and finish at 3:30, how long did it take?'
Learning Path
Skill Cluster
Measurement and Data
Estimated Time
12 minutes
Skills Practiced
regroup hours minutes
Prerequisites
- Telling Time
- Basic Subtraction
- Time Units
Next Steps
- Multi-step Time Problems
- Time Conversions Across Units
- Adding Time Intervals
- Time Word Problems
- Time Conversions