Henry Ernest Dudeney/Puzzles and Curious Problems/156 - Multiplying the Nine Digits
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Puzzles and Curious Problems by Henry Ernest Dudeney: $156$
- Multiplying the Nine Digits
- They were discussing mental problems at the Crackham's breakfast-table,
- when George suddenly asked his sister Dora to multiply as quickly as possible:
- $1 \times 2 \times 3 \times 4 \times 5 \times 6 \times 7 \times 8 \times 9 \times 0$
- How long would it have taken the reader?
It is suspected that mental problems means in this context problems in mental arithmetic rather than anything related to illness.
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Sources
- 1932: Henry Ernest Dudeney: Puzzles and Curious Problems ... (previous) ... (next): Arithmetical and Algebraical Problems: Various Arithmetical and Algebraical Problems: $156$. -- Multiplying the Nine Digits
- 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Arithmetical and Algebraical Problems: Digital Puzzles: $141$. Multiplying the Nine Digits