Neighbor Numbers Ruler V2
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A 3D-printed tactile learning tool consisting of a number line (0–20) and a movable three-window slider.
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Informacje o modelu
- Źródło
- Printables
- Kategoria
- Math
- Licencja
- Creative Commons — Attribution — Noncommercial — Share Alike
The Neighbor Numbers Ruler is a tactile aid that helps children understand the structure of the number range up to 20 visually and tangibly. It serves to translate the concepts of predecessor and successor from an abstract level into a concrete action.
1. The Problem and the Solution
The Challenge: On a normal number line from 1 to 20, a lot of information is visible at the same time. This can visually overwhelm children ("visual overload"), causing them to lose focus on the target number.
The Solution: The slider acts as a "focus window." It hides all irrelevant numbers and isolates only the three crucial values: the target number in the middle, as well as its direct neighbors to the left and right.
2. How it Works (The Analogy)
Imagine the ruler like a train track and the slider like a train car with three compartments:
The middle window (The target number): This is where the "train driver" gets in. The child slides the car to the number given in the task (e.g., 12).
The left window (The predecessor): This window automatically points to the number that comes "one step before." It is the compartment for the predecessor.
The right window (The successor): This window points to the number that comes "one step after." It is the compartment for the successor.
3. Learning Objectives and Benefits
Isolation of difficulty: The window strictly directs attention to the neighbor relationship.
Tactile feedback: Physically moving the slider anchors the logical sequence (left = smaller/before, right = larger/after) in motor memory.
Self-checking: Children can independently verify if their guess is correct by moving the slider to the corresponding number.
4. Usage Tips for the Classroom/Home
Seek & Find: "Slide the window to the 15. Which number is hiding on the left in the predecessor window?"
Guessing game: Cover the outer windows of the slider with your finger. The child names the neighboring numbers, and you pull your finger away to check.
Color theory: If you make the 3D print in two colors (e.g., a white ruler, a colorful slider), the contrast is increased, which particularly helps children with perceptual difficulties.
5. Print settings
Without supports, 20% infill, ruler flat, slider upright
6. V2
25% smaller as V1, without supports, 100% infill, ruler flat, slider upright