Using an inch ruler, have your child measure the length and width of various objects around the house. For example, coffee table, favorite poster, movie case, CD case, placemat etc.
Determine the object's perimeter by adding the lengths of all of the sides. If the object is a square or rectangular shape, calculate the area as well. (Area = length x width). You can also use centimeters (metric ruler) instead of inches (customary ruler).