Mathematics done with a focus on speed of
calculation rather than accuracy. This change in priority often results in wild approximations and unvalidated
assumptions, leading to low quality answers. Often used in rough-work to check previously calculated answers, or in physics-related pub arguments.
See also, napkinmath.
Red: Quick!
How much worse would it be for Venus to crash into
the Earth than Mars?
*pause for quickmath*
Blue: Well, Venus has twice the radius, and it's a volume, so... 8. It would be 8 times as bad.
Red: Wow. Science is
awesome.