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8th grade vocabulary 1. Integer: positive and negative whole numbers and zero 2. Negative number: a number less than zero 3. Positive number: a number greater than zero 4. Whole number: a number with no decimal or fraction part 5. Cube root: a number, written as: x∙x∙x =³√x 6. Irrational number: a number that can not be written as a ratio. Non-repeating and non-terminating. Ex: Pi 7. Perfect cube: cube of a whole number Ex: 2^³ =8 8. Perfect square: a square of a whole number 9. Principal square root: non negative square root of a number 10. Rational number: any number that can be expressed as a ratio of two numbers 11. Real number: a rational or irrational number 12. Repeating decimal: a decimal in which one or more of the digits repeats infinitely 13. Square root: a number that is multiplied by itself to form a product is called a square root of that product √25 =5 ,5 is the square root of 25 14. Terminating decimal: A decimal number that ends or terminates 15. Exponent: the number that indicates how many times that base is used as a factor 16. Standard notation: the normal way to write a number 17. Power: a number produced by raising a base to an exponent. 18. Scientific notation: a method of writing very large or very small numbers by using power of 10. _______________________________________________ 19. Constant-a value that doesn’t change. 20. Equivalent ratios-two ratios that have the same value when simplified. 21. Proportion-an equation that states that two ratios are equivalent. 22. Rate of change- is a ratio of the amount of change in the dependent variable, or output, to the amount of change in the independent variable, or input. 23. Unit rate-rate in which the rate is expressed as a quantity of 1. 24. Slope-A measure of the steepness of a line on a graph; the rise divided by the run. 25. Proportional relationship- A relationship between two equal ratios. 26. Variable rate of change- the relationship is not constant. 27. Order pair- a pair of numbers that can be used to locate a point on a coordinate plan. 28. x-coordinate-the first number in an ordered pair, it tells the distance to move right or left from the origin (0,0). 29. y-coordinate-the second number in an ordered pair, it tells the distance to move up or down from the origin (0,0). 30. linear equation-is an equation whose solutions form a straight line on a coordinate plane. 31. slope- intercept-A linear equation written in the form y = mx + b 32. y-intercept-The y-coordinate of the point where a graph of a line crosses the y-axis 33. function-An input-output relationship that has exactly one output for each input. 34. bivariate data-a set of data that is made up of two paired variables 35. nonlinear relationship- a relationship between two variables in which the data does not increase or decrease together at the same rate 36. coordinates - the set of numbers (x,y) used to locate a point on a coordinate plane 37. coordinate plane- a plane formed by the intersection of a horizontal number line called x-axis and a vertical number line called the y-axis. _______________________________________________________