Cone : A cone is a three-dimensional shape that has a base circle and a point called the vertex such that all lines from the vertex to the circumference of the circle are part of the shape.

Cube : A cube is a three-dimensional shape with 6 faces that are all squares. A cube has 8 corners and 12 edges.

Cylinder : A cylinder is a three-dimensional shape that looks like a can. It has two faces that are circles and a wrapped around rectangle face that sits perpendicular in between these two circles.

Shape : A shape is a set of points in space.

Sphere : A sphere is a three-dimensional shape that has a boundary equal to a set of points with a constant distance to a point. The point is called the center of the sphere and the distance is called the radius $r$ of the sphere. The volume of a sphere with radius $r$ is $\frac{4}{3}\pi r^3$ and the surface area is $4\pi r^2.$

Three-dimensional shape : A three-dimensional shape is a shape that has a volume.

Digit : A digit is a symbol used in the representation of a number.

Number : A number $x$ is a mathematical symbol representing a quantity.

Count : To count means to find out the number of objects by adding one for every object.

Number : A number $x$ is a mathematical symbol representing a quantity.

Skip count : Skip counting refers to repeatedly adding the same number to a starting number. For example skip counting in twos starting at 3 results in 3, 5, 7, 9... Skip counting in threes starting in 1 results in 1, 4, 7, 10,...