Create a set of 9 cards that are numbered 1 to 9. Select 4 cards at random and use the numbers on all 4 the cards and the 4 operations (add, subtract, multiply and divide) so that the result is 24. For example if the numbers are 9, 6, 8, 1 then one possibility is 1 x (9 - 6) x 8.
What if the numbers were 6, 2, 7, 3?
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Solution:
One possibility is 7 x 6 / 2 + 3
What if the numbers were 9, 3, 7, 7?
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