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Math Derby Vocabulary Third Grade 1. the measure of how much a container can hold – CAPACITY 2. numbers that are multiplied in a multiplication problem – FACTORS 3. a number that is written using both a whole number and a fraction – MIXED NUMBER 4. a polygon with three sides and three angles – TRIANGLE 5. a number that cannot be evenly divided by 2 and ends in 1, 3, 5, 7, or 9 – ODD NUMBER 6. a solid figure in the shape of a ball – SPHERE 7. the distance around a closed plane figure or region – PERIMETER 8. a number that can be evenly divided by 2 and ends in 0, 2, 4, 6, or 8 – EVEN 9. the number written above the line in a fraction – NUMERATOR 10. a line that divides a figure into 2 halves that match exactly – LINE OF SYMMETRY 11. the result of multiplying numbers – PRODUCT 12. the number of square units needed to cover a region – AREA 13. figures that have the same size and the same shape – CONGRUENT FIGURES 14. an angle that forms a square corner – RIGHT ANGLE 15. a name given to time between 12 noon and midnight – P.M. 16. a quadrilateral with four right angles; the opposite sides are the same length – RECTANGLE 17. the answer when subtracting two numbers – DIFFERENCE 18. two numbers used to name a point on a coordinate grid – ORDERED PAIR Birmingham City Schools Revised January 2005 1 Third Grade Vocabulary Math Derby Vocabulary Third Grade 19. the number written below the line in a fraction; it tells the number of parts in all – DENOMINATOR 20. the amount left over after dividing - REMAINDER 21. a solid figure with six faces that are congruent squares – CUBE 22. a number from 0 to 1 that indicates the chance of something happening – PROBABILITY 23. a customary unit of length equal to 12 inches – FOOT 24. a customary unit of weight equal to 16 ounces – POUND 25. a name given to time between midnight and noon – A.M. 26. a straight path that goes indefinitely in opposite directions – LINE 27. an operation that gives the total number when you put together equal groups - MULTIPLICATION 28. a customary unit of length equal to three feet or 36 inches - YARD 29. a rectangular arrangement of objects in rows and columns – ARRAY 30. lines that never intersect – PARALLEL LINES 31. two lines that intersect to form right angles – PERPENDICULAR LINES 32. a polygon with four sides - QUADRILATERAL 33. information gathered by observing, counting, or measuring – DATA 34. a dot used to separate dollars from cents and ones from tenths in a number – DECIMAL POINT 35. a part of a line that has two end points – LINE SEGMENT 36. a part of a line that has one end point and continues endlessly in one direction – RAY 37. in the base-10 numeration system, one of the symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9 which can be used to write any number – DIGIT Birmingham City Schools Revised January 2005 2 Third Grade Vocabulary Math Derby Vocabulary Third Grade 38. a collection of related addition and subtraction, or multiplication and division facts, made from the same numbers - FACT FAMILY 39. an exact position often marked by a dot - POINT 40. a chart on which data is recorded – TALLY CHART 41. the difference between the greatest and least numbers in a set of data – RANGE 42. a closed plane figure formed by three or more line segments that meet only at their endpoints – POLYGON 43. a display of data along a number line – LINE PLOT 44. one out of ten equal parts of a whole – TENTHS 45. a number in the form of a/b that names part of an object or collection of objects, compares two quantities, or represents division – FRACTION 46. to give an approximate number or answer – ESTIMATE 47. a property of addition and multiplication that says that changing the order of the elements being added or multiplied will not change the sum or product – COMMUTATIVE PROPERTY 48. in the metric system, a unit of capacity used to measure liquid. It is equal to 1,000 milliliters – LITER 49. a metric unit of length equals to 100 centimeters – METER 50. a 6-sided polygon – HEXAGON Birmingham City Schools Revised January 2005 3 Third Grade Vocabulary