Choosing Appropriate Units of Time (353)

Teaching Notes

Emphasize connecting time units to real-world activity durations. Discuss why certain activities take minutes versus hours or seconds.

Vocabulary

Second: A very short unit of time.

Minute: A medium unit of time.

Hour: A long unit of time.

Common Mistakes

• Confusing seconds/minutes for longer durations like hours.
• Choosing a unit that is not reasonable for the activity's actual duration.
• Guessing instead of visualizing or estimating the activity's length.

Differentiation

Discussion Questions

• What activities do you do that take about one minute?
• When would it make sense to measure an activity in seconds?
• Why is it important to know how long different activities take?
• Can you describe an activity that would take several hours to complete?

Extension Activities

• Time activities with a stopwatch.
• Compare durations.
• Plan a day using time units.

Parent Tip

Ask your child if an activity takes seconds, minutes, or hours.

Skill Cluster

Measurement (Time)

Estimated Time

15 minutes

Skills Practiced

Prerequisites

• Identifying parts of a clock
• Telling time to the hour/half-hour
• Understanding basic daily routines

Next Steps

• Calculating elapsed time
• Converting between units of time
• Estimating duration
• Telling Time
• Elapsed Time
• Time Conversions