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Estimate and Measure Lengths
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Estimate and Measure Lengths
Nathan, Tane and Freya are checking the lengths of equipment before the theme park opens. Estimate first, then measure with a ruler or tape measure where possible. Use centimetres (cm) for shorter lengths and metres (m) for longer lengths. For questions about real objects, write your own measurement; answers will vary.
Estimate before you measure
Use sensible benchmark lengths: a 30 cm ruler, a 1 m metre stick, and 100 cm = 1 m.
1.Freya needs to estimate the length of a theme-park ticket. Which is the most sensible estimate?
- About 6 cm
- About 60 cm
- About 6 m
2.A queue rail is about 4 m long. How many 1 m metre-stick lengths is that?
3.Tane estimates a bench is 2 m long. He measures it as 185 cm. Was his estimate too long or too short, and by how much? (Hint: 2 m = 200 cm.)
4.Nathan measures three ride signs: 48 cm, 1 m, and 75 cm. Put their lengths in order from shortest to longest.
Measure and compare
For the next tasks, use a ruler or tape measure. Measure to the nearest centimetre unless a question says otherwise.
5.Measure a pencil or pen you have. Record its length, then say whether your first estimate was longer or shorter than the measurement.
6.Measure the long side and short side of a book. Write both measurements with units. Which side is longer, and what is the difference?
7.A game booth banner is 250 cm long. Complete the conversion: 250 cm = m cm.
8.A measuring tape starts at 0 cm. Tane measures a prize box and gets 36 cm. What should he check if the box does not start at the tape's zero mark?
9.A ride entrance is 3 m wide. A safety mat is 275 cm wide. Is the mat wide enough to cover the entrance? Explain using the same unit.
10.Freya estimates a 30 cm ruler as 25 cm. How far off is her estimate? Is the estimate an overestimate or an underestimate?
11.Choose a safe object nearby, such as a book, desk edge or drink bottle. Estimate its length, measure it, and calculate how many centimetres your estimate differs from the measurement.
12.Which benchmark is most useful for estimating whether a theme-park ride is 20 m long?
- The width of your finger
- The length of a 1 m metre stick repeated about 20 times
- The length of a 30 cm ruler used once
3 printable pages
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