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Measure and Estimate Objects
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Measure and Estimate Objects
Help plan a picnic by estimating and measuring objects. Use a ruler or tape measure for length and a kitchen scale for mass. Record sensible estimates first, then measure real objects you can find. Use centimetres (cm), metres (m), grams (g) or kilograms (kg).
Estimate, then measure
Choose the object described in each question. Write your estimate before measuring. Answers will vary depending on the object you choose.
1.Find a pencil or pen. Estimate its length in centimetres, then measure it with a ruler. Record both results.
2.Find a book. Estimate the length of its longest side in centimetres, then measure it. Record both results.
3.Choose a longer object nearby, such as a table edge or a bed. Estimate its length in metres, then measure it with a tape measure. Record both results.
4.Find a piece of fruit. Estimate its mass in grams, then weigh it on a kitchen scale. Record both results.
5.Find an empty drink bottle. Estimate its mass in grams, then weigh it. Record both results.
Make sense of measurements
Use the measurement facts in each question to solve the picnic-planning challenge.
6.A kete strap is 80 cm long. Is that longer or shorter than 1 metre? Explain how you know.
7.The picnic bag has a mass of 2 kg. The lunch containers have a total mass of 750 g. Which is heavier, and by how many grams?
8.Put these lengths in order from shortest to longest: 45 cm, 1 m, 75 cm. Write the list and explain how you compared them.
9.Hana estimates that a full drink bottle has a mass of 1 kg. The scale reads 600 g. Was her estimate too high or too low? By how much?
10.Why is it useful to estimate before measuring? Give one example of how an estimate can help you check a measurement.
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