Skill: Find elapsed time across hours

Explanation and Free Practice Resources

Elapsed time across hours is the duration between a starting time and an ending time when the interval crosses one or more hour marks, expressed in hours and minutes. The reasoning involves decomposing the interval into the minutes remaining to reach the next hour and the time thereafter, using clock faces, timelines, or number lines and understanding that 60 minutes make 1 hour; situations involving dates, seconds, or more complex time systems are beyond this scope.

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Detailed Explanation: Find elapsed time across hours

To find elapsed time, count from the starting time to the ending time in parts:

Count the minutes to the next hour.
Count the whole hours.
Count the remaining minutes.
Combine the parts.

Example: How much time passes from 2:35 to 5:10?

From 2:35 to 3:00 is $(25)$ minutes.
From 3:00 to 5:00 is $2$ hours.
From 5:00 to 5:10 is $(10)$ minutes.

Now combine:

25\text{ minutes}+2\text{ hours}+10\text{ minutes} =2\text{ hours }35\text{ minutes}

So, the elapsed time is 2 hours and 35 minutes.

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Time - Elapsed - Two Times To Hours & Minutes - Five Minutes

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