For more details on how this rounding works, see https://www.explainxkcd.com/wiki/index.php/2585:_Rounding.
Rounding
Tag: xkcd
Selection Bias
Decorative Constants
Constructing the Null and Alternate Hypotheses
Fun with units
Source: https://xkcd.com/2526/
Bayes’ Theorem
Source: https://xkcd.com/2545/
Fun with statistical significance
Source: https://xkcd.com/2533/
Useful geometric formulas
Geometry textbooks always try to trick you by adding decorative stripes and dotted lines.
If you’re having trouble getting the formulas behind the joke, please see https://www.explainxkcd.com/wiki/index.php/2509:_Useful_Geometry_Formulas.
Usefulness of Mathematical Symbols in a Fight
Source: https://xkcd.com/2343/
Garbage math
I really liked xkcd’s take on numerical analysis and error propagation:
Source: https://xkcd.com/2295/
A good mathematical explanation of this comic can be found here: https://www.explainxkcd.com/wiki/index.php/2295:_Garbage_Math
Mean Green Math 