Memory Span Test
See how many digits you can hold in mind at once. Watch the sequence, then type it back.
A short row of digits will flash on screen, one at a time. When they stop, type them back in order. Each round you get right adds one more digit.
What your score means
Your digit span is the longest row of numbers you can repeat back in order. Most people land somewhere between five and nine. That range is not an accident. In 1956 George Miller described the magical number seven, plus or minus two, the rough limit on how many separate items short-term memory can juggle at once. Digits are easy to hold, so scores often sit near the top of that band.
Later work suggested the true bottleneck is smaller. Nelson Cowan argued that once you strip away rehearsal and grouping tricks, the focus of attention holds about four chunks, not seven. The gap between the two numbers is chunking. When you group “4, 8, 2” into a single unit rather than three loose digits, you spend one slot instead of three. Phone numbers, card numbers and dates all lean on this. It is why practised people can push their span well past nine without any change to the underlying limit.
This ceiling is the reason short lessons work. Cram ten new ideas into one sitting and most of them never make it past working memory. Break the same material into small pieces, one clear chunk at a time, and each piece gets the room it needs to stick. That is the logic behind what microlearning is, and it pairs with the forgetting curve guide to explain both how much you can take in at once and how to keep it from fading afterwards.