| Least Common Multiple – The smallest multiple that two or more numbers have in common.
Length – The distance along something from end to end, or the time something lasts from beginning to end.
Less Than – One number has a smaller value than another number. Represented by the symbol <
Line – A set of points that continue without end in both directions.
Line of Symmetry – A line that divides a figure into two halves that are exactly alike.
Line Segment – Part of a line that contains the set of points between and including the two endpoints.
Liter – A basic metric unit for measuring liquid.
Mass – Quantity of matter in an object.
Mean – Equal to the sum of values in a set divided by the number in the set. It is also known as the average.
Median – The middle value, after ranking the values from least to greatest, of a number in a set. If there is an even number of values in the set, take the mean of the middle two numbers.
Meter – A basic metric unit for measuring length and distance. It is about the width of a door.
Metric Measurement – A measuring system based on the decimal system and multiples of 10. This is the measurement system used in most of the world.
Mile – A customary unit for measuring length and distance. It is equal to 5,280 feet. It is used to measure long distances, such as the distance between two towns.
Milli- - A prefix meaning one thousandth.
Millions – 1,000,000; equal to one thousand groups of one thousand.
Minute - A unit of time that is equal to 60 seconds.
Mixed Number – A value that combines a whole number and a fractional amount.
Mode – In a set, the value occurring most often.
Multiple – Numbers that are in that number’s times table, and divisible by that number with no remainder.
Nonagon – A polygon with nine sides.
Number Line – A line used to show numbers in order from least to greatest.
Number Sentence – An equation that is formed with numbers and mathematical symbols.
Numerator – The part of a fraction, above the line of a fraction, that stands for how many parts of a whole or group are included in the fraction.
Obtuse Angle – An angle measuring more than 90 and less than 180 degrees.
Octagon – A polygon with eight sides.
Odd Number – A number that cannot be evenly divided by 2. These are numbers that have 1, 3, 5, 7, or 9 in the ones place value.
Operation – A mathematical process such as addition, subtraction, multiplication, and division.
Ordered Pair – Two numbers that identify a point on a grid.
Ounce – A customary unit for measuring weight. It takes 16 of these to equal a pound.
Parallel – Lines in the same plane that are the same distance apart and do not intersect.
Parallelogram – A quadrilateral with two pairs of congruent, parallel sides.
Pattern – Things that happen over and over again. A repeated design or recurring sequence.
Pentagon – A polygon with five sides.
Perimeter – The distance around a figure.
Permutations in Probability – Changes in the order of objects where order is significant.
Perpendicular – Intersecting lines that cross to form 90 degree angles.
Pint – A customary unit for measuring capacity. It is equal to the following: 16 fluid ounces and 2 cups. It takes 2 of these to equal one quart, and 8 of these to equal one gallon.
Place Value – The amount that each digit stands for in a number.
Point – A position in space, or a position on a number line.
Polygon – Three or more line segments in a plane that form a closed figure.
Possible Combinations - The total number of events that can happen in a probability experiment.
Pound – A customary unit for measuring weight. It is equal to 16 ounces.
Prime Factor – A factor that is also a prime number.
Prime Factorization – Breaking down a composite number until all of the factors are prime.
Prime Number – A number with only two factors: the number itself and 1.
Prism – A solid figure that has two congruent, parallel polygons as its bases.
Probability – The chance that a particular outcome will occur, measured as a ratio of the total possible outcomes.
Product – The result of multiplying two or more numbers.
Proper Fraction – A fraction that is smaller than one whole, and the denominator is larger than the numerator.
Proportion – An equation stating that two ratios are equal.
Pyramid – A solid figure that has triangles for its sides and a polygon as its base.
Quadrilateral – A polygon that has four sides.
Quart – A customary unit for measuring capacity. It is equal to the following: 32 fluid ounces, 4 cups, and 2 pints. It takes four of these to equal a gallon.
Quotient – The result of dividing one number by another; the solution to a division problem.
Range – The difference between the least and greatest values in a set of numbers.
Ray – Part of a line that extends an infinite distance from an endpoint at one end.
Reasonable – An answer that is neither extreme nor excessive, and make sense.
Rectangle – A quadrilateral with four equal angles, and two pairs of equal parallel sides.
Rectangular Prism – A geometric figure with six rectangular faces. At each vertex, all sides meet at right angles.
Rectangular Pyramid – A geometric figure with 5 faces. Four of the faces are triangles, and one of the faces is a rectangle.
Reflection – A mirror image of a figure drawn across a line of symmetry.
Remainder – The left over amount after dividing a number.
Rhombus – A quadrilateral with all sides equal and congruent.
Right Angle – An angle that measures 90 degrees.
Rotation – Turning a figure without changing its size or shape.
Round - Change a number to a more convenient value.
Second - A standard unit of time. It takes 60 of these to equal 1 minute.
Simplify – To make a fraction easier to work with by taking out common factors.
Solid – A three-dimensional figure having length, width, and height.
Sphere – A geometric figure made up of a set of points forming a curved figure. All points in the set are the same distance from the center, and it is similar to a ball.
Square – A quadrilateral with all four sides equal and all four angles equal to 90 degrees.
Square Pyramid – A solid figure that has 5 faces, 1 face that is square, and 4 faces that are triangles.
Straight Angle – An angle that measures 180 degrees.
Sum – The total of two or more numbers being added.
Temperature – A measure of how hot or cold something is.
Ten Billions – 10,000,000,000; equal to ten groups of one billion.
Ten Millions – 10,000,000; equal to ten groups of one million.
Tenths – One part out of 10 equal parts.
Thousandths – One part out of one thousand.
Ton – A customary unit for measuring weight. It is equal to 2000 pounds.
Translation – A change in position, resulting from a slide with no turn.
Trapezoid – A quadrilateral with one pair of parallel sides.
Triangle – A three-sided polygon with three angles totaling 180 degrees.
Triangular Prism – A solid with 5 faces. 2 of the faces are triangles and 3 of the faces are rectangles.
Triangular Pyramid – A solid figure with 4 triangular faces.
Trillions – 1,000,000,000,000; a thousand groups of one billion.
Vertex – The point of intersection for two sides of a plane figure, three sides of a solid figure, or the endpoints of two rays that form an angle; a corner. The plural of this is vertices.
Vertical – At right angles to the horizon, north to south, up and down, top to bottom.
Volume – The amount of space an object takes up. It is usually measured in cubic units.
Weight – The mass of the object times the force of gravity.
Whole Number – The set of numbers that includes zero and all of the natural numbers (1, 2, 3, 4, and so on.)
X-Axis – The horizontal number line of a coordinate graph.
Yard – A customary unit for measuring length and distance. It is equal to both 36 inches and 3 feet. It is about the width of a door.
Y-Axis – The vertical number line of a coordinate graph.
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