s1math is a fast, focused drill to move basic arithmetic from effortful System 2 thinking to automatic System 1 reflexes. Press Start, answer as quickly and accurately as you can before the timer runs out, and watch your XP, streaks, and level grow. Difficulty adapts automatically as you improve, or set it manually with the slider. Rounds are short and repeatable—aim for fluent recall rather than step-by-step calculation, letting speed grow from accuracy. The Log tools let you copy or download your round, and you can paste the log plus the analysis prompt into ChatGPT to get an automated skills report and targeted practice list.

Log syntax examples:

✔ 7+5=12 in 0.73s
✘ 7+5 (ans 12) wrong in 1.45s
⏱ 7+5 (ans 12) timeout