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Measuring Lengths Accurately
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Measuring Lengths Accurately
Aotearoa’s community garden is planning a new path. Help the team take accurate measurements, convert units and check their calculations. Show working where needed, and include units in every measurement.
Measure and choose
Use sensible tools and accurate measuring methods.
1.The team needs to measure a 4.8 m garden-bed edge. Which tool is the best choice, and why?
2.A student places the 1 cm mark of a ruler at the start of a seed packet. The other end lines up with 9.6 cm. What is the packet’s length? Explain the adjustment.
3.Which measurement is recorded with a suitable unit and sensible precision for the length of a path across a garden?
- 6.372 m
- 6.4 m
- 64 km
- 6.4 mm
Convert and compare
Keep track of place value and units as you work.
4.Convert these measurements. a) 235 cm to metres b) 1.08 m to centimetres c) 3.6 km to metres
5.The path is planned to be 3.75 m long. A supplier sells edging in 25 cm lengths. How many lengths are needed to cover the path exactly?
6.A rectangular garden bed is 2.4 m long and 85 cm wide. Find its perimeter and give your answer in centimetres.
Accuracy in action
Spot errors and plan reliable measurements.
7.For a 1.2 m timber piece, three students record 120 cm, 1.20 m and 12 cm. Which result is incorrect? Explain how you know.
8.A tape measure is stretched loosely and sags while measuring a straight garden border. Will the recorded length tend to be too large, too small or unchanged? Explain.
- Too large, because the sagging tape follows a longer curved route
- Too small, because the tape is not touching the ground
- Unchanged, because the endpoints are the same
- It depends only on the unit used
9.Plan how to measure a straight 18 m fence line using a 5 m tape measure. State how you would keep the measurement accurate and how you would record the final result.
10.The team measures a border as 2.36 m. Round this length to the nearest centimetre, then write the rounded length in centimetres.
2 printable pages
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