Operation span
Judge a sum, remember the letter that follows it, and repeat. When the sums run out, type the letters back in order.
Each sum has a time limit. It is generous, but it stops you rehearsing.
- Letters held
- 0 / 4
- Active time
- 0:00
Judge the sum, hold the letter.
Decide whether each sum on screen is right or wrong. After each one you will see a letter to remember. When the sums run out, type all the letters in the order you saw them.
Letters only. Backspace to correct.
This sends this round — score, settings, active time and task counts — to Studio AM with a random guest ID, and keeps sharing later rounds until you turn it off. No name, no individual answers, no drawings, and nothing from your earlier history.
How to play
A sum appears, like 7 × 4 = 26. Decide whether it is right or wrong.
As soon as you answer, the sum disappears and a letter takes its place. Remember it. Then the next sum appears.
When the sums run out, type every letter you saw, in order.
Each sum has a time limit. It is generous, because this is not an arithmetic speed test. It exists so you cannot sit on the sum and rehearse the letters, which is what the sums are there to prevent.
Letters never repeat within a round, and there are no vowels, so the run cannot be held as a word.
Your recall and your sums are reported separately. Ignoring the sums to protect the letters shows up in the score rather than being averaged away.
History stays in this browser. Community sharing is off until you choose. Guest settings
Give feedback
Optional and off by default. Share starts, completions, replays and error categories with our team. No answers, drawings or names.
How this data is used