A key pairs each symbol with a number. Below it, rows of symbols wait for the matching number to be written underneath, as quickly and accurately as possible. It is one of the most recognizable formats in cognitive practice because it looks simple and asks for almost everything at once: scanning the row, looking up the key, holding the pairs in mind, and keeping a steady pace without letting accuracy slip.
This page covers the symbol digit format. You can download a free moderate-level worksheet below, read how the standardized Symbol Digit Modalities Test relates to it (and why a practice sheet is not the test), see how the 30-worksheet set is graded, and get a few ways to run it in a session or at home.
Download the free symbol digit worksheet
Download the PDFWorksheet SNM2B from the set: a seven-symbol key and five rows of thirteen symbols, with space to record correct items, errors, and completion time. Free for personal, educational, and session use.
- Level: moderate
- Key: 7 symbols
- Items: 65
- Timing: 90 seconds is the convention
- Paper: US Letter
What is a symbol digit task?
Each worksheet opens with a key: a row of symbols, each paired with a number. Underneath are rows of the same symbols in a scrambled order, with an empty box under each one. The person works left to right, writing the number that matches each symbol, and the page is scored on how many were completed correctly, how many errors were made, and how long it took. If writing is slow or effortful, the numbers can be said aloud instead while a partner records them.
The format looks like a simple matching exercise, and for the first few items it is. What makes it demanding is the pace. Until the pairs are learned, every symbol means a glance back up to the key, and the eyes have to return to the right spot in the row each time. Speed and accuracy pull against each other for the whole page.
Processing speed
How quickly each symbol is recognized, matched, and answered. The main thing the page measures over time.
Visual scanning
Moving between the row and the key without losing the place. Skipped boxes are the tell.
Working memory
Holding symbol-number pairs in mind so fewer glances at the key are needed. The reason the last rows go faster.
Sustained attention
Keeping the same pace and accuracy through row five as in row one. Compare the first and last rows.
The Symbol Digit Modalities Test, and why this is not it
The format comes from the Symbol Digit Modalities Test (SDMT), a standardized instrument developed by Aaron Smith and published in the 1970s. The test uses a fixed nine-symbol key, a 90-second time limit, and either a written or an oral response, and it is widely used in research and clinical screening of processing speed, notably in multiple sclerosis studies. It is published and licensed by Western Psychological Services, comes with age-based norms, and is administered and interpreted by trained professionals.
Worth knowing: the worksheets on this page borrow the format, not the test. The keys and symbols are different, there are no norms, and nothing here produces a score that can be compared to a population. They are structured cognitive practice materials. They are not assessment, diagnostic, or treatment tools. If someone is going to be assessed with the SDMT, tell the clinician about any symbol digit practice, since familiarity with the format can affect how a score is read.
How the 30 worksheets are graded
Ten worksheets at each of three levels, and the key order changes from page to page so it has to be learned fresh each time:
Basic
A four-symbol key and four rows of eleven symbols. Forty-four items with a key small enough to learn in the first row.
Moderate
A seven-symbol key and five rows of thirteen. Sixty-five items, and the key now takes real effort to hold. This is the free sample above.
Complex
A ten-symbol key and five rows of seventeen. Eighty-five items, with similar-looking symbols (two arrows, two triangles) that punish a quick glance.
| What you get | Free sample | Full set |
|---|---|---|
| Worksheets | 1 | 30 |
| Levels | Moderate | Basic, moderate, complex |
| Key sizes | 7 symbols | 4, 7, and 10 symbols |
| Items per page | 65 | 44 to 85 |
| Space for time, correct items, and errors | Yes | Yes, every page |
| Repeat sessions without reusing a page | One page | Weeks of practice |
Using it in a session or at home
- Time it, then count. The convention borrowed from the test is 90 seconds. Stop, count correct items and errors, and write both down. Correct items per minute is the number to watch across weeks.
- Or leave the clock off. Untimed is the right way to learn the format. Add timing once the person is comfortable, not before.
- Say it instead of writing it. If handwriting is slow or effortful, the person says each number and a partner records. The task is the same; the bottleneck is not.
- Watch the rows, not just the total. A first row that is accurate and a last row full of errors says something different from steady errors throughout.
- Move up when it gets easy. When the moderate key is learned by the second row, the ten-symbol pages are ready.
Prefer a screen? We also offer a free interactive version, Symbol Match on our tools site, which times every response and reports correct items per minute and whether pace held up across the run. Nothing to print, free to use.
Who uses symbol digit worksheets
- Occupational therapists and speech-language professionals
- Rehabilitation and community programs
- Educators working with adult learners
- Caregivers supporting cognitive practice at home
- Adults looking for structured, printable processing-speed activities
All of our worksheets are designed to be adult-appropriate, visually clean, and easy to understand without unnecessary visual clutter.
The free worksheet above is a single moderate-level sample. If you want the full graded progression, our Symbol Digit Modalities set includes 30 worksheets across basic, moderate, and complex levels. It is also part of the complete attention bundle with trail making, cancellation, and vigilance sets.
These materials support cognitive stimulation and structured practice. They are not medical treatment, and no specific therapeutic outcomes are claimed.
