Materials: a variety of classroom objects; string; scissors Directions: 1. Each child chooses a classroom object and estimates the length of the object by cutting a string the estimated length. 2. Have each child then compare the length of the string with the actual object. 3. Is the string longer or shorter than the object? Variations: 1. Give pairs of children a length of string. 2. They search for things that are about the same length as their string. 3. Children can keep a record by drawing pictures. Estimate the circumference of a pumpkin or basketball.