Elapsed Time on an Open Number Line

What is the primary tool used for calculating elapsed time in this method?

• Open number line

• Calendar

• Physical clock

• Digital clock

What do mountains symbolize in this method?

• 5 minutes

• 30 minutes

• 10 minutes

• 1 hour

How many hours are represented by three mountains?

• 1 hour

• 4 hours

• 3 hours

• 2 hours

What intervals can hills represent?

• 30 minutes

• 5 or 10 minutes

• 1 minute

• 15 minutes

What is the purpose of writing down the new time after adding mountains or hills?

• To calculate the number of stones needed

• It is not necessary to write it down

• To keep track of the elapsed time

• To remember the starting time

What do stones represent in this method?

• 1 minute

• 5 minutes

• 10 minutes

• 1 hour

If you start at 4:30 and add three mountains and eight hills of five minutes each, what time is it?

• 7:40

• 8:05

• 8:00

• 7:30

How many minutes have passed from 4:32 to 8:08 according to the method described?

• 3 hours and 36 minutes

• 3 hours and 38 minutes

• 4 hours

• 2 hours and 35 minutes

What is the final step in calculating elapsed time with this method?

• Adding more hills

• Drawing the number line

• Adding more stones

• Counting up hours and minutes

Can stones be added before hills in this method?

• Yes, to make counting easier

• No, hills always come first

• Only if you are calculating more than 3 hours

• Stones and hills cannot be used together