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

by : $311$

 * Domino Multiplication
 * We have received the following entertaining puzzle from W.D.W., of Philadelphia, Pa.:


 * 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.


 * Dudeney-Puzzles-and-Curious-Problems-311.png


 * 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.