Mental addition: ten 10-digit numbers, World Cup rules
How it works
Each task is ten 10-digit numbers in a column. Add them in your head and write only the total. You have 7 minutes.
Scoring
As in the 2024 World Cup rules: one point for each right answer, one point off for each wrong answer, and the score never goes below zero.
For reference
The winning addition score at the 2024 Mental Calculation World Cup was 29 points.
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