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The Ruler Question block creates interactive measurement activities where learners drag ruler endpoints to measure an object or identify a length. The question supports tolerance-based marking for realistic measurement scenarios.
Ruler Questions support centimeters, inches, and millimeters, with configurable tolerance for flexible marking.

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When to use Ruler Questions

Ruler Questions work well for:
  • Measuring objects using a ruler
  • Reading lengths from a ruler display
  • Practicing measurement in different units
  • Estimating and verifying lengths
  • Developing precision in measurement skills

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Settings

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Measurement settings

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select
default:"Centimeters"
The unit of measurement on the ruler:
  • Centimeters: Metric centimeter markings
  • Inches: Imperial inch markings
  • Millimeters: Metric millimeter markings
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input
default:"12"
The total length of the ruler in the selected unit.
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input
default:"0"
The starting value on the ruler.

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Display settings

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switch
default:"true"
When enabled, displays half-unit tick marks on the ruler.
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switch
default:"true"
When enabled, displays numeric labels along the ruler.
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select
default:"Medium"
The display size of the ruler:
  • Small: Compact display
  • Medium: Standard display
  • Large: Larger display for projection or emphasis

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Measurement image

You can add an image of an object to be measured. The image can be cropped and positioned along the ruler to create a realistic measurement scenario.

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Answer and marking

Set the correct answer by specifying:
  • Value: The correct measurement length
  • Unit: The unit of measurement
  • Tolerance: How close the learner’s answer must be to count as correct (e.g., 0.5 cm tolerance means answers within half a centimeter are accepted)

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Response settings

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select
default:"Correct"
Determines when the question is considered complete:
  • Correct: The learner must answer correctly to proceed.
  • Answered: Any response is accepted; correctness isn’t required.
  • Optional: The learner can skip the question entirely.
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slider
default:"0"
The number of attempts the learner can make before the question is locked (0–3). Set to 0 for unlimited attempts.
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slider
default:"5"
The experience points awarded for answering the question correctly (0–10).

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Tips for teachers and parents

Best practices:
  • Start with whole-number measurements before moving to half units
  • Use a generous tolerance for younger learners who are still developing fine motor skills
  • Hide measurement numbers for more challenging activities
  • Use the measurement image feature to make activities feel real-world
  • Set a non-zero start value to reinforce that measurement can begin anywhere on a ruler
  • Progress from centimeters to millimeters as learners develop precision
  • Ruler: Display-only version for teaching and demonstration
  • Thermometer Question: For temperature-based measurement questions