(4*4)-(4/4)
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One possible solution is: 4.4 + 4 / .4 = 21
4/4 x 4 =16/4 = simplest form = 4
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!
Only if you subtract three.