Time
Elapsed time between two clocks
Read a starting and ending analog clock, then calculate the amount of time that passes between them.
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Elapsed time
Find elapsed time from digital starting and ending times. Choose hours, minutes or combined durations, the maximum duration and AM/PM labels, then print a worksheet and separate key.
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Start with a ready-made worksheet
Identify the start, end and any day or AM/PM context. Count forward in convenient steps and total the duration. Keep elapsed time separate from the clock time at which the interval ends.
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What this activity builds
Measure the interval between two clock times without treating minutes as decimal hundredths.
Worked example
An event runs from 11:35 AM to 1:10 PM on the same day. How much time passes?
1 hour 35 minutes.
There are 25 minutes to noon, then 1 hour to 1:00 PM, then 10 minutes to 1:10 PM. Adding these parts gives 1 hour and 35 minutes; crossing noon changes the AM/PM label, not the length of an hour.
Teaching notes
Make the practice count
- Starting-time steps controls only which minute values can start an interval. It does not set duration-minute or ending-time steps. For example, a 20-minute starting grid can still produce an ending time at 1:07.
- Begin with whole-hour jumps before combining hours and minutes.
- Mark noon or midnight explicitly whenever a task crosses it, and use the stated context when AM/PM labels are omitted.
- Ask the learner to add the completed duration back to the starting time as a check.
Count elapsed time across midnight
From 11:40 PM to 1:15 AM the next day, count 20 minutes to midnight, 1 hour to 1:00 AM and 15 more minutes. The elapsed time is 1 hour 35 minutes. The day changes at midnight; the hour still contains 60 minutes.
AM/PM questions can cross noon or midnight. Starting-time steps sets the starting grid only; it is not a filter for overnight questions and does not force the ending time onto that grid. The hours-only and hours-and-minutes settings control duration form.
Use the two-clock activity for analog reading plus duration calculation, or the elapsed-time table to fill a missing start, end or duration.
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Complete equivalent time amounts and unit names, using the correct relationship between the units in each question.
Preview and downloadChoose the elapsed-time format
Find a positive duration from digital start and end times, including intervals across midnight. Starting-time steps constrain only the starting clock: a 20-minute start step does not require the end or duration to be a multiple of 20 minutes. Use the two-clock resource for analog reading, or the table resource for missing starts, ends and durations.