Problem

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the Day

Problem

of

the Day

MultiplicationMultiplication

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Arrange the four dominoes to form a 3-digit and a 1-digit factor with their

product. Think of each half of a domino as separate 1-digit number, but you cannot separate dominoes.

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In order to solve my problem, I must arrange the dominoes so that I have four digits as factors and four digits as my product. I know that I

must use two dominoes for my 3-digit factor and one digit factor. I also

must use two dominoes for my four digit product. I cannot separate the

dominoes. The digits on the dominoes are 4, 5, 1, 4, 2, 1, 3,5.

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After several attempts using trial-and-error, my answer would be

4,1,5 × 3 = 1,2,4,5. This answer is correct because 415 × 3 = 1,245.

451 × 4 does not equal 2,135

531 × 2 does not equal 4,145

145 × 3 does not equal 2,145415 × 3 does equal 1,245

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Answers: 415 × 3 = 1,245

4 1 5 × 3

1 2 4 5

=

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