fourteen take away four and then add a four and times by (2 times 4)
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444 + 444 + 44 + 44 + 4 + 4 +4*4
4! - 44/4 = 24 - 11 = 13
Google "Four Fours" and you will find a number of solutions, presented more comprehensively than we can.
As a solution to the four fours problem (using the number four no more than four times to come up with the solution, 31 is equal to (4!+4)/4+4!
There are several ways of making 10 using four fours. Amongst them are the following: (44 - 4)/4 = 10 44 / 4.4 = 10 4 + sqrt(4) + sqrt(4) + sqrt(4) = 10