Decodyne Math Wall Clock [amazon.com]
$9.57 plus Free Shipping for Prime Members or with orders over $25.
Enter code MATH40OF
A UNIQUE WAY TO TRACK THE HOURS Instead of Roman numerals or traditional numbers, this wall clock has a different equation at each demarcation
PERFECTLY SIZED Clock measures 11-1/2 inches in diameter and is easy to spot from afar
GO WITH EVERYTHING DESIGN Black and white color scheme makes the clock look like a chalkboard and will complement any color palette
GREAT GIFT IDEA Give one of these wall clocks to a math teacher, engineer, mathematician or anyone who just loves numbers
NO CORDS OR WIRES Clock runs on one AA battery (not included)