Mental division: 10-digit by 5-digit, Memoriad format
How it works
Each task divides a 10-digit number by a 5-digit number, and the answer is always a whole 5-digit number. Work it out in your head and write the result.
The format comes from the Memoriad mental calculation events. The time limit and the +1/−1 scoring here are practice defaults, not contest rules.
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