Measurement applications: limits of accuracy

Solve substantial, realistic measurement problems involving error- bound propagation -- a paved patio's area, a paddock's fencing perimeter, a wall's paintable area around a window, a concrete slab's volume, a decking area with a rounded quarter-circle corner, and a triangular land survey's boundary via Pythagoras' theorem -- using the convention that a measurement "given to the nearest X" has an implied tolerance of plus-or-minus half of X, recomputing each calculation using the most extreme plausible inputs to find the minimum and maximum possible final answer, and correctly choosing which extreme (upper or lower) of each input pushes the final answer toward the overall minimum or maximum given that specific formula's structure, then discussing whether that uncertainty range actually changes the real-world decision being made.

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Learning objective overview

Master Teaching Guide coverage for this objective.

Current NZC (2007)
  • GM6-1
New NZC (2026)
  • NZC26-P4-MEA-MEA-K-Y9-01
  • NZC26-P4-MEA-MEA-K-Y10-01

Resources

Terminology

  • Measurement tolerance
  • Upper bound
  • Lower bound
  • Central estimate
  • Nearest unit
  • Error propagation
  • Worst case

Task goals

  • Apply the convention that a measurement "given to the nearest X" has an implied tolerance of plus-or-minus half of X, and state the resulting interval of possible true values.
  • Calculate the central (best) estimate of a measurement-based quantity -- area, perimeter, or volume -- from the given measurements.
  • Recompute the same calculation using the most extreme plausible combination of inputs to find the minimum possible final answer.
  • Recompute the same calculation using the most extreme plausible combination of inputs to find the maximum possible final answer.
  • Correctly identify, for a given formula's structure, which extreme (upper or lower bound) of EACH input genuinely produces the overall minimum or maximum -- recognising that for a calculation containing a subtraction step, the minimum of the total can require the MAXIMUM of the subtracted piece, not a blind "all lower bounds" rule.
  • Propagate two or more compounding measurement tolerances (from different measured quantities, potentially with different stated precisions) through a multi-step calculation.
  • Use a calculated minimum or maximum bound as an input to a further material-quantity, discrete-purchase, or cost calculation.
  • Determine whether a calculated uncertainty range changes a real-world decision (a discrete-purchase quantity, a budget compliance check, or a minimum-size requirement), and justify the conclusion with the actual minimum/maximum figures.
  • Recognise that an uncertainty range sometimes does NOT change the real-world decision, and explain why the central estimate alone was already a safe enough basis for that particular decision.
  • Communicate a written discussion of measurement uncertainty's real-world significance, referencing the specific minimum/maximum values found.

Where this fits

What leads into this objective, and where it goes next.

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Measurement applications: limits of accuracy

Measurement applications: limits of accuracy

Know

A solution to a calculation cannot be more precise than the least precise number used in that calculation.

Statement▸
Year 9 · Measurement · Measuring
NZC26-P4-MEA-MEA-K-Y9-01

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