| Term | Definition |
| distributive property | a number times the sum of two addends is equal to the sum of that same number times each individual addend |
| partial products | A product resulting from multiplying one factor by onr digit of the other factor. The final product is the sum of the shifted partial product |
| circle | a closed, curved shape in which all points on the shape are the same distance from its center |
| diameter | the distance across a circle through its center |
| radius | the distance from the center of a to a point on the circle |
| perimeter | the distance around a closed, flat shape |
| circumference | the distance around a circle; the perimeter of a circle |
| center | the point inside a circle from which all points on the circle are equally distant |