STAR Math Vocabulary 5th Grade

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STAR 5th gradeMath Vocabulary : 

Every Test is a Reading Test! STAR 5th gradeMath Vocabulary

Absolute Value : 

Absolute Value The distance of a number from zero on a number line.

Acute Angle : 

Acute Angle An angle measuring less than 90 degrees.


AREA Of a rectangle or parallelogram: LENGTH times HEIGHT Of a triangle: LENGTH times HEIGHT divided by two

Associative property : 

Associative property The property that states that the way addends or factors are grouped does not change the answer.

Base : 

Base A number used as a repeated factor.

Commutative Property : 

Commutative Property The property that states that when the order of two or more addends or products is changed, the answer is the same

Composite Number : 

Composite Number A whole number having two or more factors; a number that is NOT prime.

Congruent : 

Congruent Having the same size and shape.

Coordinate Plane : 

Coordinate Plane A plane formed by two intersecting and perpendicular number lines called axes.

Coordinates : 

The numbers in an ordered pair. Coordinates

Cube : 

Cube A solid figure with six congruent square faces.

Denominator : 

Denominator The number below the bar in a fraction that tells how many equal parts are in the whole.

Diameter : 

Diameter A line segment that passes through the center of a circle and has its endpoints on the circle/


DIFFERENCE The result of subtracting; the answer to a subtraction problem.

Distributive Property : 

Distributive Property The property that states that multiplying a sum by a number is the same as multiplying each addend by the number and then adding the products.

Equilateral Triangle : 

Equilateral Triangle A triangle with three congruent sides.

Equivalent Fractions : 

Equivalent Fractions Fractions that name the same amount.

Exponent : 

Exponent A number that shows how many times the base is used as a factor.

Factor : 

Factor A number that is multiplied by another number to find a product.

Factor Tree : 

Factor Tree A diagram that shows the prime factors of a number or its PRIME FACTORIZATION.

Gallon : 

Gallon A customary unit for measuring capacity. Four Quarts = 1 Gallon 8 pints = 1 Gallon 16 cups = 1 Gallon

Gram : 

Gram A metric unit for measuring mass. 1,000 milligrams = 1 gram 1,000 grams = 1 Kilogram

GCF (Greatest Common Factor) : 

GCF (Greatest Common Factor) The greatest factor that two or more numbers have in common.

Intersecting Lines : 

Intersecting Lines Lines that cross at exactly one point.

Isosceles Triangle : 

Isosceles Triangle A triangle with two congruent or equal sides.

LCM (Least Common Multiple) : 

LCM (Least Common Multiple) The smallest number, other than zero, that is a common multiple of two or more numbers

Line Symmetry : 

Line Symmetry A figure has line symmetry if a line can separate the figure into two congruent parts.

mean : 

mean A two-step process: adding all the numbers in a series, then diving the sum by the number of numbers.

median : 

median After putting a series of numbers in number order, the number in the MIDDLE.

Mode : 

Mode The number that repeats the MOST in a series of numbers.

Multiple : 

Multiple The product of a given whole number and another whole number.

Number Line : 

Number Line A line with equally spaced tick marks named by numbers.

Numerator : 

Numerator The number above the bar in a fraction that tells how many equal parts of the whole are being considered.

Obtuse Angle : 

Obtuse Angle An angle whose measure is greater than 90° and less than 180°

Ordered Pair : 

Ordered Pair A pair of numbers used to locate a point on a coordinate plane; the first number tells how far to move on the X-axis and the second number tells how far to move on the Y-axis.

Order of Operations : 

Order of Operations Rules for performing operations in expressions with more than one operation.

Ounce : 

Ounce A customary unit for measuring weight.

Parallelogram : 

Parallelogram A quadrilateral whose opposite sides are parallel and congruent.

Percent : 

Percent The ratio of a number to 100.


PERIMETER The sum of all the sides of a shape.

Perpendicular Lines : 

Perpendicular Lines Two lines that intersect to form four right angles.

Prime Number : 

Prime Number A whole number greater than 1 that has exactly two factors, one and itself.

Probability : 

Probability The likelihood that an event will happen.

Product : 

Product The result of multiplying; the answer to a multiplication problem.

Quotient : 

Quotient The result of dividing; the answer to a division problem.

Radius : 

Radius A line segment with one endpoint at the center of a circle and the other endpoint on the circle. Radius = ½ Diameter

range : 

range The difference between the BIGGEST and the SMALLEST numbers in a series of numbers.

Right Angle : 

Right Angle An angle measuring EXACTLY 90 degrees.

Rounding : 

Rounding Replacing a number with one that tells about how many.

Simplest Form : 

Simplest Form A fraction is in simplest form when it has been reduced to its smallest form.

SUM : 

SUM The result of adding; the answer to an addition problem.

Volume : 

Volume Multiplying HEIGHT times WIDTH times DEPTH to measure of the amount of space a solid figure occupies.

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