Henry Ernest Dudeney/Puzzles and Curious Problems/156 - Multiplying the Nine Digits

by : $156$

 * 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.