JS floating point math goes awry when you do 1.07 + 1 - 2.07, it returns 4.440892098500626e-16, whereas 1.00 + 1 - 2.00 returns 0.

However, when you use that same floating point math in an angular expression with a currency filter, the filter does not truncate/convert the scientific notation to $0.00.

For reference, this fiddle will display the problem: http://jsfiddle.net/mattsgarrison/vZh69/ if you provide the first input 1.07, the second input 1, and the third input 2.07.