# Original printable and plain-text decimal aids

Use [A4 SVG grid](decimal-grid.svg) or copy the text layouts below. Each model defines **one unit whole**: a strip cut into 10 equal cells or a square cut into 100 equal cells. Compare the *fraction of its whole*, not the raw area of differently shaped print models. With the square, each row of 10 cells is one tenth. Large/tactile variants may use a 10-row pegboard or ten long strips each subdivided into 10; label rows/columns in text for screen-reader access.

## Whole/tenths/hundredths mat

```text
ONE WHOLE = all 10 equal strips = all 100 equal small cells.

WHOLES | TENTHS | HUNDREDTHS
   __  |   __   |    __

In words: ______ whole(s), ______ tenth(s), ______ hundredth(s)
As a fraction of a whole: _____________________________
As a decimal: _________________________________________
I can check by: _______________________________________
```

**Ten-strip text model:** `[ ][ ][ ][ ][ ][ ][ ][ ][ ][ ]`; shade/fill exactly the chosen count of equal cells. **Hundred-grid text model:** 10 identical rows of 10 cells; one complete row = 10/100 = 1/10. The SVG supplies a print grid; in a text-only format, state row and column coordinates of shaded cells, e.g. “rows 1–3 all ten cells, row 4 columns 1–7” = 37/100 = 0.37. For tactile access, distinguish each row with a raised boundary and count by rows plus remainder.

## Number-line template

```text
0.0   0.1   0.2   0.3   0.4   0.5   0.6   0.7   0.8   0.9   1.0
|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|

1.0   1.1   1.2   1.3   1.4   1.5   1.6   1.7   1.8   1.9   2.0
|-----|-----|-----|-----|-----|-----|-----|-----|-----|-----|
```

When printing, use monospaced text at a readable size or draw a true equal-spaced line. The equally spaced **tick positions** are the conceptual model; if font substitution distorts this text, use a ruler to redraw. For hundredths between 0.3 and 0.4, a separate equal-spaced interval has 0.30, 0.31, …, 0.40 ticks.

## Original context cards

These are **fictional designed diagrams**, not actual measurements, ecological observations, population data or historical records. On each card, the same depicted whole is partitioned equally; teacher builds the diagram before learners infer a decimal. Keep Cards 13–16 unseen for Day 10 transfer.

| Card | Prompt for learner | Teacher key |
| --- | --- | --- |
| 1. Music loop | 3 of 10 equal beat segments are marked. | 3/10 = 0.3 |
| 2. Art strip | 7 of 10 equal paper sections are shaded. | 7/10 = 0.7 |
| 3. Transit board | 9 of 10 equal display cells are lit in a drawing. | 9/10 = 0.9 |
| 4. Story bar | 10 of 10 equal chapters in a drawn progress bar are filled. | 10/10 = 1.0 |
| 5. Garden design | 1 whole grid and 4/10 of a second equal grid are shaded. | 1.4 |
| 6. Game map | 1 whole strip and 8/10 of another same-sized strip are marked. | 1.8 |
| 7. Sports lap picture | 2 of 100 equal cells are marked. | 2/100 = 0.02 |
| 8. Mosaic | 15 of 100 equal cells are shaded. | 15/100 = 0.15 |
| 9. Poster design | 10 of 100 equal cells form one row. | 10/100 = 0.10 = 0.1 |
| 10. Costume pattern | 37 of 100 equal cells are shaded. | 37/100 = 0.37 |
| 11. Library board | 4 full rows of ten of a hundred-grid are shaded. | 40/100 = 0.40 = 0.4 |
| 12. Robot screen | 1 whole grid and 5/100 of a second equal grid are lit. | 1.05 |
| 13. Kite design | 6 complete rows and 2 more cells of a hundred-grid are shaded. | 62/100 = 0.62 |
| 14. Craft plan | 1 whole grid and 27/100 of a second equal grid are shaded. | 1.27 |
| 15. Map legend | 4/10 of a strip are marked; redraw on hundred-grid. | 0.4 = 0.40 = 40/100 |
| 16. Theatre board | 0.09 of a hundred-grid is marked. How many cells? | 9/100, 9 cells |

## Quick-check slip

```text
WHOLE SHOWN: same size in each model? yes / no
FRACTION: ____ / 10 or ____ / 100
WHOLES | TENTHS | HUNDREDTHS: ____ | ____ | ____
DECIMAL: _______
SHOW A SECOND FORM: __________________________________
RESPONSE MODE / PROMPT: _______________________________
NEXT TEACHING: ________________________________________
```

**Source/rights:** Entire aid original © NeuroForgeIO Pty Ltd 2026, CC BY 4.0; national curriculum and ACARA's separate rights in [README](README.md). Teacher review pending.