try 11 times (practicing your time tables will be a great help later on)
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33 x 33/3 = 33 x 11 = 363
3 * 3 / ( 3 * 3 ) = 1 but that uses only four 3s, so 33 / ( 3 * 3 * 3 ) = 1 uses five 3s
33 + (3/3)
28 3s
Use two of the 3s to make 33. Then: 33 - 3 = 11 11 + 3 = 14