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Puzzle #9

A multiplication using dominoes. A horizontal and a vertical dominoes represent the multiplicand and the multiplier. The horizontal domino has a number of spots, from left to right, four and question mark, forming part of the multiplicand. The vertical domino has the number of spots, from top to bottom, five and question mark, the first number of spots forms part of the multiplicand and the question mark is the multiplier. The product is represented by two horizontal dominoes, side by side. The first one has the number of spots, from left to right, one and question mark, and the second one has the number of spots, from left to right, four and five.

Find the missing points in the dominoes so that the multiplication is correct.

Solution
A multiplication using dominoes. A horizontal and a vertical dominoes represent the multiplicand and the multiplier. The horizontal domino has a number of spots, from left to right, four and one, forming part of the multiplicand. The vertical domino has the number of spots, from top to bottom, five and three, the first number of spots forms part of the multiplicand and the three is the multiplier. The product is represented by two horizontal dominoes, side by side. The first one has the number of spots, from left to right, one and two, and the second one has the number of spots, from left to right, four and five.

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