# Text and tactile route for the 51–90 chart

The original [A4 landscape chart](number-chart.svg) has four rows of ten equal cells. Read each row left to right:

```text
51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70
71 72 73 74 75 76 77 78 79 80
81 82 83 84 85 86 87 88 89 90
```

Each row ends at a new full ten. It is a **chart**, not one straight equally spaced number line: the visual jump from the end of one row to the start of the next is a layout change, while the count still increases by one. A teacher may cut the rows into a joined 51–90 strip or provide tactile large-number cards in that order. Do not infer a learner understands quantity merely because they find a printed cell.

Under the chart is a blank two-column mat: **TENS · each full strip is 10** and **ONES · each loose piece is 1**. A learner can place strips/counters, draw grouped marks, type a tens-and-ones list or direct an adult. Check one strip has ten cells before treating it as a ten. For 69 + 1, first keep six strips and ten ones, then trade the ten loose pieces for a seventh strip; both models show 70.

The SVG uses dark text on white cells and explicit words as well as borders; no colour identifies a quantity. It has a title and description for assistive technology. There are no photos, recorded voices or third-party fonts embedded.

**Rights:** Original chart and text © NeuroForgeIO Pty Ltd 2026, [CC BY 4.0](https://creativecommons.org/licenses/by/4.0/).