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Measuring and Estimating Skills
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Measuring and Estimating Skills
Help plan a pop-up kai stall for a community event. Estimate first, then calculate carefully. Use metric units throughout; 1 L = 1,000 mL, 1 kg = 1,000 g, and 1 m = 100 cm. Give units with every answer.
A. Estimate and choose a tool
Use sensible everyday estimates. You do not need equipment for these questions.
1.The stall table is about 1.8 m long. Which estimate is most reasonable for its length in centimetres?
- 18 cm
- 180 cm
- 1,800 cm
- 18,000 cm
2.Match each job to the most suitable measuring tool: measure a table’s length; find the mass of a sack of potatoes; measure 750 mL of juice; time how long a queue takes to move.
- Table length
- Sack of potatoes’ mass
- Juice volume
- Queue time
- Stopwatch
- Tape measure
- Scales
- Graduated measuring jug
3.Before measuring, estimate the mass of a single apple. Select the closest sensible estimate.
- 2 g
- 180 g
- 18 kg
- 180 kg
B. Convert and calculate
The stall team has recorded these measurements. Show a calculation or explain your method.
4.A roll of bunting is 3.45 m long. Convert its length to centimetres.
5.A water container holds 2.4 L. How many millilitres is this?
6.The fruit crate has a mass of 1.275 kg. Express this mass in grams, then round it to 2 significant figures in grams.
7.A banner is measured as 248.6 cm. Convert the measurement to metres and round to 2 decimal places.
8.The team needs 6 cups, each holding 250 mL of water. How many litres of water are needed altogether?
C. Check the plan
Spot the measurement mistake before the stall opens.
9.A volunteer says, “750 mL is 7.5 L.” Is this correct? Write the correct conversion and describe the likely place-value error.
10.A rectangular serving mat is 80 cm long and 45 cm wide. Calculate its area in cm², then convert the area to m². (Remember: 1 m² = 10,000 cm².)
11.A scale displays 0.86 kg for a bag of apples. One person records 860 g; another records 86 g. Which person is correct? Explain using a conversion.
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