Elapsed Time: Working Backwards

Front

What is elapsed time?

Back

Elapsed time is the amount of time that passes from the start of an event to the end of that event.

Front

How do you calculate elapsed time?

Back

To calculate elapsed time, subtract the start time from the end time.

Front

What is the first step in finding elapsed time?

Back

Identify the start time and the end time of the event.

Front

If a movie starts at 3:00 PM and ends at 5:00 PM, how long is the movie?

Back

The movie is 2 hours long.

Front

What does it mean to work backwards in time problems?

Back

Working backwards means starting from the end time and subtracting the duration to find the start time.

Front

If a train leaves at 2:30 PM and travels for 45 minutes, what time does it arrive?

Back

The train arrives at 3:15 PM.

Front

What is a number line?

Back

A number line is a visual representation of numbers in a straight line, used to help with addition and subtraction.

Front

How can you use a number line to find elapsed time?

Back

You can mark the start time and end time on the number line and count the intervals between them.

Front

What is 'quarter past' in terms of minutes?

Back

'Quarter past' means 15 minutes after the hour.

Front

If it is 8:00 AM and you add 30 minutes, what time is it?

Back

It is 8:30 AM.