What this test measures
Most adults remember 7 to 9 digits in this number memory test. The classic estimate for short-term memory is “seven, plus or minus two” items (Miller, 1956). Ten digits or more is above average; 12 or more usually means you group the digits into chunks.
This is a digit span task, one of the most widely used measures of verbal working memory. It is part of many intelligence and memory batteries because holding information in mind for a few seconds underlies reading, mental arithmetic and following instructions.
How it works
- Press Start. A number appears, with a bar showing how long it stays.
- When it disappears, type it and press Submit.
- Each correct answer adds one digit. The first mistake ends the test.
Your score is the longest number you typed back correctly, in digits (higher is better). Each number is shown for 1 second plus 0.6 seconds per digit.
How to do your best
- Group digits into pairs or triples: “47 – 19 – 82” is easier than eight single digits.
- Repeat the groups silently until you type them.
- Do not start typing until you have read the whole number once.