Working Memory
Number Memory Test
Remember the longest number you can. The average person can hold 7 digits in working memory.
Number Memory
The average person can remember 7 numbers at once. Can you do more?
How the Number Memory Game Works
You start with a single digit. Every correct answer adds one more, and the display time scales with length - Roughly 0.4 seconds per extra digit - So a 10-digit number gives you about five seconds to encode it. One wrong answer ends the run, and your score is the last level you cleared. Levels 1–5 feel trivial; level 7 is where most runs die; double digits is rare territory.
The global average run ends at level 7, and reaching 9 digits puts you in the top 10% of players. That 7-digit wall is no accident: in 1956 George Miller famously showed that immediate verbal memory holds about seven items, give or take two.
Baddeley's Working Memory Model
The modern scientific understanding of working memory comes from Baddeley and Hitch's multi-component model. The number memory test primarily loads the phonological loop - But skilled performers also recruit the episodic buffer and central executive.
Score Percentile Reference
| Digits Recalled | Percentile | Classification |
|---|---|---|
| 4 | Bottom 5% | Below clinical range |
| 5 | 5th–20th | Below average |
| 6 | 20th–45th | Low average |
| 7 | 45th–65th | Average |
| 8 | 65th–82nd | Above average |
| 9 | 82nd–93rd | Excellent |
| 10+ | Top 7% | Exceptional |
The Power of Chunking
Most people who score above 9 digits are not storing more units of information - They're storing fewer but larger units. Chunking transforms individual digits into meaningful groups:
Working Memory Across the Lifespan
Number recall is one of the most age-stable cognitive measures available, making it a useful benchmark for tracking cognitive health over time. Unlike processing speed, which begins declining in the mid-20s, verbal number recall remains relatively stable into the 50s before showing a modest decline. The decline that does occur reflects slower phonological rehearsal speed rather than reduced loop capacity per se.