> ## Documentation Index
> Fetch the complete documentation index at: https://help.edzo.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Ruler Question Block

> Learn how to use Ruler Question blocks to create interactive measurement activities.

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.

<Info>
  Ruler Questions support centimeters, inches, and millimeters, with configurable tolerance for flexible marking.
</Info>

## 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

## Settings

### Measurement settings

<ParamField path="Unit" default="Centimeters" type="select">
  The unit of measurement on the ruler:

  * **Centimeters**: Metric centimeter markings
  * **Inches**: Imperial inch markings
  * **Millimeters**: Metric millimeter markings
</ParamField>

<ParamField path="Length" default="12" type="input">
  The total length of the ruler in the selected unit.
</ParamField>

<ParamField path="Start at" default="0" type="input">
  The starting value on the ruler.
</ParamField>

### Display settings

<ParamField path="Show half marks" default="true" type="switch">
  When enabled, displays half-unit tick marks on the ruler.
</ParamField>

<ParamField path="Show measurement numbers" default="true" type="switch">
  When enabled, displays numeric labels along the ruler.
</ParamField>

<ParamField path="Size" default="Medium" type="select">
  The display size of the ruler:

  * **Small**: Compact display
  * **Medium**: Standard display
  * **Large**: Larger display for projection or emphasis
</ParamField>

### 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.

## 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)

## Response settings

<ParamField path="Response requirement" default="Correct" type="select">
  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.
</ParamField>

<ParamField path="Max responses" default="0" type="slider">
  The number of attempts the learner can make before the question is locked (0–3). Set to **0** for unlimited attempts.
</ParamField>

<ParamField path="XP points" default="5" type="slider">
  The experience points awarded for answering the question correctly (0–10).
</ParamField>

## 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

## Related blocks

* [Ruler](/creating/resources/math-blocks/ruler): Display-only version for teaching and demonstration
* [Thermometer Question](/creating/resources/question-blocks/thermometer-question): For temperature-based measurement questions