# Third Grade Illustrated Math Dictionary Updated As presented by the Math Committee of the Northwest Montana Educational Cooperative

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1 Acute An angle less than 90 degrees An acute angle is between 1 and 89 degrees Analog Clock Clock with a face and hands This clock shows ten after ten Angle A figure formed by two line segments that end at the same point A figure from one to 360 degrees Area Amount of surface inside a shape Area is measured in square units by multiplying the length by the width Array An arrangement of objects in rows and columns This is an array of 4 stars by 6 stars Celsius Temperature scale used in the metric system Zero degrees in Celsius equals 32 degrees in Fahrenheit **Bibliography available in a separate document. 1

2 Certain Likelihood Line Certain means absolutely sure When rolling a dice, I m certain there are six possibilities. Impossible CERTAIN Congruent Figures that are the same size and same shape are congruent These figures are all the same size and shape. Cubic Units Cubic units are measured by multiplying the height by the width by the length There are 9 cubic units in this picture Cup Data A cup is a measurement that equals eight ounces or half a pint. Information that is collected by counting, measuring, asking questions, or observing The milk cartons at lunch are a cup in measurement. Two cartons equals a pint. This chart shows data collected and made into a graph Decimeter A decimeter is 10 centimeters A decimeter is one tenth of a meter **Bibliography available in a separate document. 2

3 Degrees Degrees are a unit of measure for angles and also for temperatures There are 360 degrees in a circle and degrees on a thermometer Denominator A denominator is the number below the line in a fraction The denominator is four in one fourth Divide To divide is to separate into equal parts When you divide eight by two you get four Dividend A dividend is the number divided by another number In 728 divided by 16, 728 is the dividend **Bibliography available in a separate document. 3

4 Division Division is the operation of dividing one number by another Division is separating a number into equal parts, such as 6 divided by two equals three Dot (line) plot A dot line plot shows data on a chart This chart shows the months of the year and the average temperature for that month Equal groups Equal groups are all the same size, they have the same value This group of 25 has been split into 5 equal groups of five Equally likely Equally likely means having the same chance or probability On this spinner your chances of getting any number are all the same, you have a one in eight chance of getting any certain number **Bibliography available in a separate document. 4

5 Equilateral Equilateral refers to a triangle that has three equal angles and sides All 3 sides are the same length and all 3 angles are the same Equivalent fractions Fractions that are the same size are equivalent 4 eighths is the same as one half, so they are equivalent Equivalent Fact families Equivalent names are different ways of naming the same number Related addition or subtraction facts or related multiplication and division facts 2 plus 6, 4 plus 4, 12-4, , 5+1+2, eight, VIII, are all equivalent names for 8 5+6=11, 6+5=11, 11-6=5, 11-5=6 or 5x7=35, 7x5=35, 35divided by 7=5 and 35 divided by 5=7 **Bibliography available in a separate document. 5

6 Factor When you multiply two whole numbers to get a given number, then the two whole numbers are factors of that number 2 and 8 are factors of 16 because 2x8=16 Fahrenheit Temperature scale used in the U.S. customary system At 32 degrees Fahrenheit- (F.) water freezes Feet (ft) A customary unit of measurement. One foot equals 12 inches. Two feet equal 24 inches. 3 feet equal one yard or 36 inches. Flip (reflection) One way to move a figure A flip does not change a figure s shape Fraction A way to describe a whole or a part of a group by using equal parts One eighth would be one part of eight pieces **Bibliography available in a separate document. 6

7 Frequency table Gallon This shows the number of times a value occurs in a set of data A customary unit of capacity equal to 4 quarts Tallies can be made to keep track of how often something occurs A gallon of milk has 8 pints Gram The standard unit of mass in the metric system One gram weighs about the same as a large paperclip. Greater than (>) More than Six is greater than four 6>4 Grid A pattern of horizontal and vertical lines, usually forming squares Grid are often used in maps. Heptagon A polygon with seven sides A heptagon has seven sides that may or may not be equal sizes **Bibliography available in a separate document. 7

8 Hexagon A polygon with six sides Honeycombs have hexagonal patterns on them Impossible Not able to happen It is impossible to spin and get a six on this spinner Inch Input Getting a 6 A unit of length in the customary system This is information you feed into an equation or computer An inch is about the size of your second knuckle to your first knuckle on your index finger The input will help solve the problem, to get an output Intersecting To meet or cross Intersecting lines are at street corners Isosceles This is a triangle with two equal sides and two equal angles This is a triangle with two congruent sides Kilogram A metric unit of mass equal to 1000 grams A textbook has the mass of about one kilogram **Bibliography available in a separate document. 8

9 Length The distance along a line or figure from one point to another The room was the length of 20 feet Less than < means the small end points to the smaller number The alligator always goes towards the bigger number 4<6, read as 4 is less than 6 Likely Line segment Something with a probability of one, it is likely to happen A part of a line with two endpoints If you roll a dice, rolling a number larger than one is a likely event A line segment has a beginning and an end Line A set of connected points continuing without end in both directions The line went on forever in both directions **Bibliography available in a separate document. 9

10 Lines of reflectional symmetry Liters Median A line that divides a figure into two congruent parts that are mirror images of each other A unit of volume in the metric system for measuring liquids It is the middle number when numbers are arranged from the smallest to the greatest There can be more than one line of symmetry in a figure or there can be none. If a figure has a line of symmetry it can be folded on the line and the two halves will match exactly A liter will have 1000 milliliters(equ al to about a drop) This large pop bottle contains two liters A median could also be the mean or average of an even amount of numbers, such as 38, has the median of 45 because you take the mean of the two middle numbers (44+46) divided by 2 =45 **Bibliography available in a separate document. 10

11 Meter The standard unit of length in the metric system A meter is equal to 100 centimeters Metric Metric is the system of measurement based on tens. The basic unit of length is the meter. The basic unit of mass is the gram and the basic unit of capacity is the liter. Metric is used throughout the world, but in the picture it has ounces and those are used in the U.S. Mile A mile is a unit of measurement for length in the customary system, it equals 5280 feet A mile also equals 1769 yards **Bibliography available in a separate document. 11

12 Milligram A milligram is one thousand of a gram in the metric system A milligram would be like a pinch of salt, a few grains Milliliters A metric unit of capacity milliliters(ml) equals a kilogram. Minute A minute is a unit of time that equals 60 seconds. There are about 255 milliliters in a can of pop. A milliliter is about the size of the width of your fingernail (tiny!) There are 60 minutes in an hour. Mode 14, 14, 14, 15, 15, 16, 17, 17, 20, 23 Model 14 is the mode The number that occurs most often in a set of data A model serves as a pattern or an example In this picture the mode is 13, the number that appears the most A camera costs \$850 less than a laptop. If the laptop costs \$1739, how much is the camera? **Bibliography available in a separate document. 12

13 Multiples A multiple is the product of a given whole number and any other whole number 12 is a multiple of three and of four because 4x3=12 Multiplication The operation of repeated addition of the same number 3x6 is the same as Multiply Multiply is to add a number a given number of times 12 times 3 equals 36 Number Line Numerator A diagram that represents numbers as points on a line The number written above the line in a fraction Number lines can be any consecutive set of numbers, even negative numbers In the fraction one half, the numerator is the one Obtuse Obtuse can refer to an angle that is greater than 90 degrees and less than 180 degrees, it can also refer to a triangle that has one obtuse angle An obtuse triangle can only have one obtuse angle because angles added up in a triangle equal 180 degrees **Bibliography available in a separate document. 13

14 Octagon A polygon with eight sides A stop sign is an octagon Open Sentence Ounce 10 = X + 7 This is a math equation that needs to be filled in with an answer Ounce is a customary unit of measurement equal to one sixteenth of a pound or a fluid ounce is one sixteenth of a pint 10 = x + 7 A baby s bottle usually has about 8 ounces. Output Output is what information comes from an equation or computer If I put 10 into a machine and the ouput was 5, I could assume that is was divided by 2 Parallel Parallel means to be at the same distance throughout the length Railroad tracks are parallel to each other **Bibliography available in a separate document. 14

15 Parallelogram A quadrilateral (4 sided figure) with 2 pairs pf parallel and congruent sides A square and a rectangle can also be parallelograms Pentagon A polygon with five straight sides A soccer ball has pentagon shapes on it Perimeter The distance around a figure To find a perimeter the sides must all be added, this perimeter is 19 units Perpendicular Perimeter = 19 Perpendicular forms right angles The wall was perpendicular to the floor in the room Pint A customary unit of capacity equal to 2 cups A half pint of milk is served in the school lunches **Bibliography available in a separate document. 15

16 Point An exact location in space represented by a dot This has two points, a and b Pound A customary unit of weight that equals 16 ounces A scale will show you how many pounds you weigh Product The product is the result of multiplication 5 (factor) x 5 (factor) equals the product of 25 **Bibliography available in a separate document. 16

17 Quadrilateral A four sided polygon Quadrilaterals can be squares, rectangles, kites, trapezoids, or parallelograms Quart A customary unit of capacity that equals 2 pints 4 quarts equal a gallon Quotient The result of division 6 divided by 2 equals 3. Three is the quotient Ray A part of a line that has one endpoint and goes on forever in one direction A ray can have more than one point but has only one endpoint and always continues on **Bibliography available in a separate document. 17

18 Reasonable An answer can seem reasonable if it makes sense or a reasonable guess will be in the ballpark A reasonable guess would be that the spinner would land on red Rectangle A quadrilateral with two pairs of congruent, parallel sides and 4 right angles A square could also be a rectangle, a box has rectangle sides Represent To stand for, to be a sign or a symbol for These symbols stand for math operations, a tally mark can represent data Rhombus A parallelogram with all four sides the same length A rhombus can have a diamond shape **Bibliography available in a separate document. 18

19 Right This can mean right, such as right hand or right angle, which is 90 degrees A right angle is in a right triangle Round Round can be a circle shape or you can replace a number with a number that is close and easy to compute with, that is rounding If you are rounding and the number lands on five, always round up, less than 5, always round down Scalene Set A scalene triangle has no congruent sides A set is group of numbers or other things No sides or angles are equal in a scalene triangle A set of letters could be the alphabet **Bibliography available in a separate document. 19

20 Slide (translation) A transformation that slides a figure a given distance in a given direction A slide will move a figure without turning or flipping it Square Units A unit, such as a square centimeter or square inch, used to measure area Areas can be measured with square units, in feet or yards or meters, this area is 54 square units Square A parallelogram with 4 congruent sides and four right angles A tile floor can be made with squares Standard and Expanded Form Standard form is a number written with one digit for each place value--- Expanded form is a way to write numbers that shows the place value of each digit Standard form for two hundred and six is 206 Expanded form would be 263= **Bibliography available in a separate document. 20

21 Temperature A measure of how hot or cold something is The temperature of a human is 98.6 degrees Fahrenheit Tenths Tenths can be one of ten equal parts in a fraction and can also be in decimals, such as 0.1=one tenth One tenth of a dollar is a dime. Thirds The parts you get when you divide something into three equal parts We divided the pizza into three equal pieces Times Times can be another way to say multiplied by 6 times 2 equals 12 **Bibliography available in a separate document. 21

22 Ton A customary unit of weight equal to 2000 pounds One ton is about the weight of a large horse Trapezoid A quadrilateral with one pair of parallel sides and one pair of sides that are not parallel Some tabletops are trapezoids Triangle A polygon with three sides and three angles The scarf was folded into a triangle Turn (rotation) The transformation that occurs when a figure is turned a certain angle and direction around a point, also called a rotation A ferris wheel rotates around a point with its different angles **Bibliography available in a separate document. 22

23 Unlikely An unlikely event has a probability close to zero You are unlikely to land on one with this spinner Volume Spinning a 1 is unlikely The number of cubic units of space a solid figure takes up To find volume, you multiply the length by the width by the height Width One dimension of a 2 or 3 dimensional figure The width of the door was 3 feet Yard (yd) A customary unit of length equal to 3 feet A yard equals 36 inches **Bibliography available in a separate document. 23

24 Yardstick A 3 foot long instrument to measure a yard A wooden yardstick can be found in hardware stores **Bibliography available in a separate document. 24

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