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Measuring Length Accurately

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Measuring Length Accurately

Help plan a small community garden. Choose suitable units, read measurements carefully, and check that each calculation makes sense. Show working where asked.

Choose a useful measurement

Select the most suitable unit for each length.

1.The length of a seedling tray is about 48 ___. Choose the best unit.
  • mm
  • cm
  • m
  • km
2.A garden path is 6.4 m long. How many centimetres is this?
3.The distance from the gate to the garden is 275 cm. Write this distance in metres.

Read a ruler accurately

A ruler reading is only useful if you account for where the object starts. Use end point minus start point.

4.A plant label begins at the 2.4 cm mark and ends at the 13.1 cm mark. What is its length?
5.A seed packet starts at the 0 cm mark and ends 6.8 cm later. What is its length?
6.True or false: If an object starts at 3 cm and ends at 9 cm on a ruler, its length is 9 cm.
TrueFalse

Estimate, measure, check

You will need a ruler or tape measure for the next task. Record real measurements from objects available to you.

7.Choose a small object nearby, such as an eraser or pen. Record its estimated length first, then measure it to the nearest millimetre. Include units.
8.Kai measures the same garden bed as 2.35 m and 235 cm. Are the measurements consistent? Explain how you know.
9.A rectangular garden bed is 1.8 m long and 95 cm wide. Convert both measurements to centimetres, then calculate its perimeter.
10.A roll of edging is 8 m long. The garden bed needs 5.5 m of edging. How much edging will remain?
11.A tape measure is marked in centimetres, but the gardener writes 350 cm as 35 m. Identify the error and give the correct conversion.

2 printable pages

  • Measuring Length Accurately, page 1 of 2: Choose a useful measurement, Read a ruler accurately

    Page 1

  • Measuring Length Accurately, page 2 of 2: Estimate, measure, check

    Page 2

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