Front page > Lesson Plans > Miscellaneous > Friday's that (un)Lucky Day! Friday's that (un)Lucky Day! Here are some activities to do on Friday the 13th. Have students: make up their own superstitions; calculate how big 13 acres is; make up math problems that use the number 13; practice estimating how long 13 seconds is; run around the building 13 times; use a map to find two points in your city 13 miles apart; estimate how fast 13 miles per hour would be; write a funny story titled "13" that refers to 13 somehow as in TV channels, 13th floor, 13 years old.