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Digital Measurement Exploration

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Digital Measurement Exploration

A community market in Aotearoa New Zealand needs a safe, well-fitted stall. Use the measurements and digital-tool evidence below to make decisions. Show units in every answer. For calculations, you may use a calculator.

Check the measurements

A tablet measuring app reports the stall table as 1.78 m long and 0.74 m wide. A tape measure gives 1.80 m long and 0.75 m wide.

1.Which length is closest to 2 metres? Choose one: 178 cm, 18 cm, or 1,780 cm. Explain briefly how you know.
  • 178 cm
  • 18 cm
  • 1,780 cm
2.Convert the app's table measurements into centimetres: length = ___ cm; width = ___ cm.
3.How far apart are the app's length reading and the tape measure reading? Give the difference in centimetres.
4.The stall needs a rectangular mat that covers the whole tabletop. Use the tape measurements (1.80 m by 0.75 m). What is the tabletop area in square metres?

Use digital readings wisely

Two people measured a banner with a phone app. Their readings were 2.36 m and 2.41 m. A steel tape measure reading was 2.40 m.

5.Which phone reading is closer to the tape measure reading? State the difference in centimetres.
  • 2.36 m, which is 4 cm away
  • 2.41 m, which is 1 cm away
  • They are equally close
6.Name one sensible reason two digital measurements of the same object might differ slightly.
7.Match each measurement to the most suitable unit: thickness of a cardboard price tag; length of a table; walking distance between two market towns; width of a phone.
  • Thickness of a cardboard price tag
  • Length of a table
  • Walking distance between two market towns
  • Width of a phone
  • metres
  • centimetres
  • kilometres
  • millimetres

Plan a safe stall

The canopy frame is 2.15 m high. The market rules require at least 2.00 m of clearance underneath. A crate is 0.46 m tall and can be stacked on a 0.68 m-high bench.

8.How much clearance is there between the frame height and the required minimum?
9.Will the bench-and-crate stack leave at least 2.00 m of clearance beneath the canopy? Calculate the stack height and the remaining clearance, then decide.
10.A digital measuring app is convenient, but a tape measure is used to confirm the tabletop size. Is this a reasonable approach? Choose true or false and give one reason.
TrueFalse
11.The stall team has 5.00 m of bunting. They use 1.80 m along the front and 1.25 m along each side. How much bunting remains?
12.For a digital measurement to be repeatable, what should you do before taking a second reading? Give two practical steps.

3 printable pages

  • Digital Measurement Exploration, page 1 of 3: Check the measurements

    Page 1

  • Digital Measurement Exploration, page 2 of 3: Use digital readings wisely, Plan a safe stall

    Page 2

  • Digital Measurement Exploration, page 3 of 3: 10. A digital measuring app is convenient, but a tape measure is used to confirm the…

    Page 3

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