Mental square roots to 8 significant digits, World Cup rules
How it works
Each task is a 6-digit number. Work out its square root in your head to 8 significant digits and write it down. You have 10 minutes.
Scoring
An answer counts as right if it is within 0.000005 of the true root, as in the 2024 rules. You get one point for each right answer and lose one for each wrong answer, never going below zero.
For reference
The winning square root score at the 2024 Mental Calculation World Cup was 82 points.
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