# Plain-text and tactile alternatives for the three print aids

These original diagrams use black outlines and labels on white; colour is never a code. Give this selectable text to anyone who uses a screen reader, prefers text, needs larger print, cannot use the illustrations or wants to make tactile cards. The SVGs have `<title>` and `<desc>`; PDFs are printable visual exports and should be accompanied by this file for accessible reading. Neither layout nor line drawing is essential to the lesson.

## Rational benchmarks

[SVG](rational-benchmarks.svg) · [A4 PDF](rational-benchmarks.pdf)

A horizontal 0–1 number line has **five equally spaced positions**. From left to right they are:

| Position | Fraction | Decimal | Percentage |
|---|---:|---:|---:|
| left endpoint | 0 | 0.00 | 0% |
| first quarter | 1/4 | 0.25 | 25% |
| midpoint | 1/2 | 0.50 | 50% |
| third quarter | 3/4 | 0.75 | 75% |
| right endpoint | 1 | 1.00 | 100% |

`3/8 = 0.375` lies between 1/4 and 1/2. The prompt asks: **What is the whole in your example?** A printable blank line is for an answer. Tactile route: fold one strip into four equal lengths, mark endpoints and each crease with a raised dot, then attach matching text or braille labels. A learner can place a separate 3/8 card between the first quarter and midpoint and explain why. The strip and labels must represent equal intervals; do not position numbers by word length.

## Decision and evidence board

[SVG](decision-evidence-board.svg) · [A4 PDF](decision-evidence-board.pdf)

The page has five large numbered boxes, each with writing space. The prompt says the fictional club has **one activity slot and $60 supplies limit**. The boxes are:

1. **My recommendation:** name one option and a reason.
2. **Source facts:** quote a price or count accurately and name its scope.
3. **Predicted benefit:** say what may happen; do not call it a measured fact.
4. **Next-best alternative:** name your second-ranked feasible option and the benefit given up.
5. **Limit and next check:** say what is missing and what you would verify.

Bottom reminder: **Price is a money cost. Opportunity cost is the benefit of the next-best feasible choice you give up.** Fixed access and safety conditions are never optional. Text-only route: copy the five numbered prompts into a document or speak/dictate an answer to each. Tactile route: lay out five numbered cards with a separate word/texture marker for “given fact”, “prediction” and “unknown”; read each label. Do not use texture as the only explanation of a category.

## Six model shape cards

[SVG](model-leaves.svg) · [A4 PDF](model-leaves.pdf)

Six **fictional leaf-like paper outlines**, in two rows of three, all upright. Each card has a large printed code and a full trait label. These are **not real species**. The traits are outer blade edge (entirely smooth or visibly jagged), tip at the top (rounded or pointed), and straight stem at the bottom (long or short). The long stem is at least approximately the blade width in this **specific drawing model**; short stem is much shorter. Card definitions:

| Code | Outer edge | Top tip | Bottom stem |
|---|---|---|---|
| S1 | smooth | rounded | long |
| S2 | smooth | rounded | short |
| S3 | smooth | pointed | short |
| J1 | jagged | rounded | long |
| J2 | jagged | pointed | long |
| J3 | jagged | pointed | short |

Text-only two-choice key for **these six cards**:

1. If the outer edge is entirely smooth, go to 2. If it includes any jagged section, go to 4.
2. If the top tip is pointed, tentatively label S3. If rounded, go to 3.
3. If the stem is long, tentatively label S1. If short, tentatively label S2.
4. If the tip is rounded, tentatively label J1. If pointed, go to 5.
5. If the stem is long, tentatively label J2. If short, tentatively label J3.
6. **Verify every feature in the full card description.** If one conflicts with the tentative label, record “unmatched”. The printed key covers only its stated set; a new card may need a new route.

The seventh challenge card is **not printed**: one jagged side and one smooth side, rounded tip, short stem. Under the “any jagged section” rule it reaches the tentative J1 label, but J1 has a long stem, so the full-description check returns **unmatched**. This is an intentional model limit. A learner may instead extend the key with a branch for the new shape and retest all seven. Do not force it to match a real taxon.

Tactile route: cut six large cards, use a continuous curved cord for smooth edge or notched cardboard for jagged edge, make rounded/pointed top shapes, and attach visibly/tactually distinct long/short stems. Use printed/braille code and spoken full trait label alongside touch. Avoid sharp cutting during class; an adult prepares pieces. A partner can manipulate cards at a learner's direction.

## Reuse and format note

Original SubjectNest diagrams and this text: **CC BY 4.0**, © NeuroForgeIO Pty Ltd. Credit “SubjectNest by NeuroForgeIO Pty Ltd”, link to [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/) and indicate changes. The PDF may embed DejaVu font subsets, with [separate font terms](FONT-RIGHTS.md). No ACARA descriptions or third-party artwork are embedded in the print aids. Local educator/access review remains pending.