Matrix Multiplication

Directions: Using the digits 1-9, each only once, fill in the blanks to create the smallest possible value for a.


What rows/columns from the first matrix impact a?
What rows/columns from the second matrix impact a?


There are many possible solutions for digit positioning, although the pairs should be constant. 1 & 6, 2 & 5, 3 & 4. One example would be:
power logs

Source: Bryan Anderson

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  1. A variant might be to fill in the blanks to find the smallest (or largest) value of |a – b|

  2. Love this question. Not seeing how the answer is 0, though. All digits are positive …

    I’m getting 6(1) + 5(2) + 4(3) = 28

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