Henry Ernest Dudeney/Puzzles and Curious Problems/311 - Domino Multiplication/Solution

Puzzles and Curious Problems by Henry Ernest Dudeney: $311$

Domino Multiplication

Four dominoes may be so placed as to form a simple multiplication sum if we regard the pips as figures.

The example here shown will make everything perfectly clear.

Now, the puzzle is, using all the $28$ dominoes to arrange them so as to form $7$ such little sums in multiplication.

No blank may be placed at the left end of the multiplicand or product.

Solution

Sources

• 1932: Henry Ernest Dudeney: Puzzles and Curious Problems ... (previous) ... (next): Solutions: $311$. -- Domino Multiplication
• 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Answers: $490$. Domino Multiplication