Does 2 plus 2 always equal 4?

Answer 1

No, there are different forms of measurement in which not all scales can be added together. Here is a site to better understand: http://virgil.azwestern.edu/~dag/lol/TwoPlusTwo.html Also, if the calculations are being done at a higher level of precision than displayed, 2.4 (rounds to 2) + 2.4 (rounds to two) = 4.8 (rounds to five). There's a saying in computer science that "2 + 2 = 5, for large values of two" to remind people that this can be an issue.