Here is my factor tree
I chose number 15 because I like it!
With Cuisenaire rods you can make shapes with number 15
Fifteen (english) = quince (spanish)
Quince (english) = membrillo (spanish)
15 minutes = a quarter hour
This year is 2015.
1 may 2015 = 1/5/15
Magic square. The numbers in each row, and in each column, and the numbers in the main and secondary diagonals, all add up 15.
According to legend, it originated around 2205 BC when the Emperor discovered the magic square on the back of a turtle.
There are 15 players in a Rugby team.
There are 15 balls in billiards.