ANSWERS: 2

Use a computer program that rounds values. For example... 2.49 + 2.49  4.98 However, if you were to round these numbers to the nearest whole number, you would have... 2 + 2  5 So, 2 + 2 = 5, for extremely large values of 2. :)

That phrase comes from a math joke "2+2 = 5 (for large values of 2)" Many theorems are only true for sufficiently large n. So "for sufficently large n" is a standard phrase and it has been turned into a joke by making it apply to the number 2 which can't be any larger than it is.
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