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4. A comparison by division of two quantities with different units.
8. A set of step-by-step instructions for doing something, such as carrying out a computation or solving a problem.
10. Where the earth and sky appear to meet, if nothing is in the way.
11. A number sentence that contains an equal sign.
12. A number used to locate a point on a number line, a point's distance from an origin.
15. An informal name for a reflection transformation.
16. An amount left over when one number is divided by another number.
17. The set of all numbers between two numbers a and b, which may include one or both of a and b.
18. The use of letters of the alphabet to represent numbers in equations, formulas, and rules.
19. A number line showing when events took place.

1. A line segment joining two nonconsecutive vertices of a polygon.
2. A product of a counting number and all smaller counting numbers.
3. The middle value in a set of data when the data are listed in order from smallest to largest or vise versa.
5. A letter or other symbol that represents a number.
6. The zero point in a coordinate system.
7. The result of dividing one number by another number.
9. A region bounded by and including an arc and two radii of a circle.
13. The set of all points in a plane that are equality distant from a fixed point in the plane called the center of the circle.
14. The curve formed by the intersection of a right circular cone and a plane parallel to the lateral edge of the cone.