Students review weight as measured in grams and ounces, estimate the weight of objects. No distinction is made between mass and weight in this unit, and the terms are used interchangeably. We will also work and play with 2-dimensional figures and 3-dimensional shapes. Certain 3-dimensional shapes are referred to as "geometric solids." By definition, such shapes are not, in fact, "solid" but consist only of the enclosing surfaces. That is, cylinders, cones, prisms, and so on, are empty rather than full. The interior points are not included unless there is a specific referenc3e to a shape and its interior.

Volume is a measure of the amount of space inside a 3-dimensional shape. Students will develop the concept of volume by building 3-dimensional structures and by filling 3-dimensional structures to compare the contents. It is important to note that , like other measures, volume and capacity are expressed with both numbers and units. Usually volume units are cubic units, based on some linear measure; for example, cubic centimeters, cubic inches, cubic meters, cubic yards, and so on. In everyday life, it is common to express capacities in units that are not cubic units: teaspoons, cups, pints, gallons, liters, barrels, bushels, and so on. These standards were developed centuries ago to measure things poured into or out of containers. Every locality had its own system of measures, and a variety of standards persists even today.

Activities