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Measuring Time with Whole Numbers

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Measuring Time with Whole Numbers

Solve each problem using whole numbers. Show your working for calculations, and include units in your answers.

Plan the trip

A group is planning a day trip from Wellington. Use the timetable below for Questions 1–3.

Activity

Time

Leave Wellington

8:35 am

Arrive at the reserve

10:05 am

Guided walk begins

10:25 am

Lunch ends

1:10 pm

Leave the reserve

2:40 pm

1.How long does the trip from Wellington to the reserve take, from 8:35 am until 10:05 am?

2.The group has 20 minutes between arriving at the reserve and the guided walk. If the walk starts at 10:25 am, what time did the group arrive?

3.The group has 1 hour 30 minutes for lunch. Lunch ends at 1:10 pm. What time did lunch begin?

Track the time

Use the number line to think about elapsed time and rounding.

4.A nature guide speaks for 47 minutes. Round this duration to the nearest 10 minutes.

40 minutes
45 minutes
50 minutes
60 minutes

5.A short track is 2 minutes 15 seconds long. How many seconds is that altogether? Show your calculation.

6.A stopwatch shows 3 minutes 20 seconds. How many seconds must pass for the total time to reach 5 minutes?

Make a sensible estimate

Use what you know about everyday activities to choose and explain reasonable times.

7.Which is the most reasonable estimate for a person to walk 100 metres at a steady pace?

About 2 seconds
About 2 minutes
About 2 hours
About 2 days

8.A group tests how long it takes to walk a short path. Their times are 78 seconds, 82 seconds and 80 seconds. Find the mean time in seconds.

9.Rangi estimates that 30 hand claps will take 3 seconds. Is this likely to be a sensible estimate? Explain your reasoning using a realistic approximate time.

10.The group leaves the reserve at 2:40 pm and arrives back in Wellington at 4:05 pm. How long is the return journey? Give your answer in hours and minutes.