Give the child a foot rule and let him become acquainted with its
length. Then with his fingers on the table have him indicate the
distance which he believes to equal that of the length of the rule. Lay
it between the child's fingers. Practice until he knows accurately how
long a foot is. At the same time and for variety he can practice with
a half foot and an inch. Have him compare objects with a foot rule and
determine whether they are longer or shorter. Then let him measure the
objects. Allow the child to check the measurements himself, this will
increase his definite conception of the length of a foot.