What do you call a number that loves to travel? A Roamin' Numeral!
This ancient mathematics joke, plays off the similar sounding Roamin' (short for roaming) and Roman (the ancient culture). If a number loves to travel, it probably loves to roam! Hence the happy Roamin' Numeral!
3.14% of Sailors are Pi-rates
Pirates, the desperadoes of the seas, may have once been regular sailors. However, thanks to the "pi" in pi-rates we have 3.14% (that is, the value of pi) have converted to the hard life of a pi-rate. So really, this joke is playing off the beginning of the word "pirate" containing "pi" which is a mathematical constant that approximates to 3.14. Additionally, pirates could be considered a subset of all sailors. Hence, 3.4% of all sailors could be pi-rates.
Much like the hippotenuse, this creature lies along the longest side of a right triangle (also known as the hypotenuse). It's name makes for a great play on words.
Glasses in Math Class
This joke is a complete play on words. "Division" is a mathematical operation many young children learn in school. "Di-vision" also sounds like "the vision" which is exactly what glasses are designed to improve!