When purchasing footwear from a retail store or online, it is important to know the right shoe size. Wearing shoes of an incorrect size can cause a plethora of issues including blisters and injuries ...

How many inches are in a foot? Pick inches or feet to measure the length of objects. Warm up with a Mystery Math Mistake to add 2 two-digit numbers. Explore how many inches there are in a foot.

The U.S. is finally adopting the international foot. Measurements are updated pretty regularly, considering they're so static otherwise. The change is unfathomably minuscule to anyone but big-picture ...