Estimation


 * Comparison Estimator - Similar to Estimator but compares two sets of objects.
 * Estimation of Length - Online lesson then an activity to follow the lesson
 * Estimator - Practice estimation skills by determining the number of objects, length, or area.
 * How Many Pearls - You've just stumbled on a treasure chest filled with pearls and you want a quick estimate of the number, without having to count them one by one.
 * More or Less Estimator - Similar to Estimator activity but states a quantity and asks the user to estimate whether the set of objects is more or less than the number given.