Mathematical Vocabulary Lionville Elementary School 2015-2016

Why Math Word of the Week? Words taken from PDE Math Glossary Words intended for grades 3-5 It is assumed that Grade 5 students mastered Grades 3 & 4 vocabulary It is assumed that Grade 4 students mastered Grade 3 vocabulary Words will be included in PSSA Understanding words will improve our students’ ability to problem solve Words are critical for mathematical development

any number that is being added Grade 3 Math Vocabulary Addend- any number that is being added

the measure, in square units, of the inside of a plane figure Grade 3 Math Vocabulary Area- the measure, in square units, of the inside of a plane figure

a rectangular arrangement of objects in equal rows or columns Grade 3 Math Vocabulary Array- a rectangular arrangement of objects in equal rows or columns

Associative Property- Grade 3 Math Vocabulary Associative Property- add or multiply no matter how the numbers are grouped

Grade 3 Math Vocabulary Average/Mean- the sum of a list of numbers divided by the number of numbers in the list

display of data using bars of different heights Grade 3 Math Vocabulary Bar Graph- display of data using bars of different heights

Commutative Property- Grade 3 Math Vocabulary Commutative Property- changing the order of the addends or factors does not change the answer

the number below the line in a common fraction; a divisor Grade 3 Math Vocabulary Denominator- the number below the line in a common fraction; a divisor

a statement that two mathematical expressions are equal Grade 3 Math Vocabulary Equation- a statement that two mathematical expressions are equal

Grade 3 Math Vocabulary Equivalent- having the same value

a plane figure that serves as one side of a solid figure Grade 3 Math Vocabulary Face- a plane figure that serves as one side of a solid figure

Grade 3 Math Vocabulary Factor- a whole number that divides evenly into another whole number (e.g. 1, 3, 5, and 15 are factors of 15

represents a part of a whole Grade 3 Math Vocabulary Fraction- represents a part of a whole

a straight path extending in both directions with no endpoints Grade 3 Math Vocabulary Line- a straight path extending in both directions with no endpoints

a graph showing the frequency of data on a number line Grade 3 Math Vocabulary Line Plot- a graph showing the frequency of data on a number line

Grade 3 Math Vocabulary Number Line- a straight line with a "zero" point in the middle, with positive and negative numbers listed on either side of zero and going on indefinitely.

an equation or inequality with numbers Grade 3 Math Vocabulary Number Sentence- an equation or inequality with numbers

the top number in a fraction which shows how many parts we have Grade 3 Math Vocabulary Numerator- the top number in a fraction which shows how many parts we have

the rules that say which calculation comes first in an expression Grade 3 Math Vocabulary Order of Operations- the rules that say which calculation comes first in an expression

Grade 3 Math Vocabulary Pentagon- a polygon with 5 sides

the distance around a figure Grade 3 Math Vocabulary Perimeter- the distance around a figure

a graph that uses pictures to show and compare information Grade 3 Math Vocabulary Pictograph- a graph that uses pictures to show and compare information

the value of where the digit is in the number Grade 3 Math Vocabulary Place Value- the value of where the digit is in the number

a flat surface that extends infinitely in all directions Grade 3 Math Vocabulary Plane- a flat surface that extends infinitely in all directions

a closed plane figure having three or more sides Grade 3 Math Vocabulary Polygon- a closed plane figure having three or more sides

the answer of a multiplication problem Grade 3 Math Vocabulary Product- the answer of a multiplication problem

Grade 3 Math Vocabulary Quadrilateral- a four-sided polygon

the answer in a division problem Grade 3 Math Vocabulary Quotient- the answer in a division problem

a parallelogram with four equal sides Grade 3 Math Vocabulary Rhombus- a parallelogram with four equal sides

the answer in an addition problem (the total) Grade 3 Math Vocabulary Sum- the answer in an addition problem (the total)

a table that uses tally marks to record data Grade 3 Math Vocabulary Tally Chart- a table that uses tally marks to record data

Grade 3 Math Vocabulary Time (analog & digital)- a point of time as measured in hours and minutes past midnight or noon

a square whose sides have length 1 Grade 3 Math Vocabulary Unit Square- a square whose sides have length 1

the amount of space (in cubic units) that a solid figure can hold Grade 3 Math Vocabulary Volume- the amount of space (in cubic units) that a solid figure can hold

Grade 3 Math Vocabulary Whole Number- whole numbers are positive numbers, including zero, without any decimal or fractional parts

an angle with a measure less than 90 degrees Grade 4 Math Vocabulary Acute Angle- an angle with a measure less than 90 degrees

a triangle with all three angles acute (less than 90°) Grade 4 Math Vocabulary Acute Triangle- a triangle with all three angles acute (less than 90°)

two angles that have a common vertex and a common side Grade 4 Math Vocabulary Adjacent Angles- two angles that have a common vertex and a common side

the figure formed by two rays Grade 4 Math Vocabulary Angle- the figure formed by two rays

a whole number having more than two factors Grade 4 Math Vocabulary Composite Number- a whole number having more than two factors

Grade 4 Math Vocabulary Decagon- 10-sided polygon

Grade 4 Math Vocabulary Decimal Notation- representation of a fraction or other real number using the base ten and consisting of any of the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, and a decimal point

Grade 4 Math Vocabulary Degree (angle)- a measure for angles

Degree (temperature)- Grade 4 Math Vocabulary Degree (temperature)- a measure of temperature (how hot or cold it is) The symbol for degrees is °

a number by which another number is to be divided Grade 4 Math Vocabulary Divisor- a number by which another number is to be divided

Equilateral Triangle- triangle in which all three sides are equal Grade 4 Math Vocabulary Equilateral Triangle- triangle in which all three sides are equal

Expanded Form (Expanded Notation)- Grade 4 Math Vocabulary Expanded Form (Expanded Notation)- a way to write numbers that shows the value of each digit (e.g., 4,372 = 4000 + 300 + 70 + 2 or 10 x 10 x 10=103)

Grade 4 Math Vocabulary Factor Pair- a set of two numbers, which when multiplied result in a definite number

Grade 4 Math Vocabulary Function- a special relationship between numbers where each input has a single output

Grade 4 Math Vocabulary Heptagon- a polygon with 7 sides

Grade 4 Math Vocabulary Hexagon- a polygon with 6 sides

a whole number; a number that is not a fraction Grade 4 Math Vocabulary Integer- a whole number; a number that is not a fraction

two sides of equal length Grade 4 Math Vocabulary Isosceles Triangle- two sides of equal length

Least Common Denominator- Grade 4 Math Vocabulary Least Common Denominator- he least common multiple of the denominators in two or more fractions

either of the two sides that form an angle in a triangle Grade 4 Math Vocabulary Leg (of triangles)- either of the two sides that form an angle in a triangle

Grade 4 Math Vocabulary Line of Symmetry- a line that divides a figure into two halves that are mirror images of each other

a part of a line with two endpoints Grade 4 Math Vocabulary Line Segment- a part of a line with two endpoints

Grade 4 Math Vocabulary Multiple- the product of a given whole number and another whole number (e.g., multiples of 4 are 4, 8, 12, 16. . . )

Grade 4 Math Vocabulary Nonagon- a polygon with 9 sides

an angle with a measure more than 90 degrees Grade 4 Math Vocabulary Obtuse Angle- an angle with a measure more than 90 degrees

Grade 4 Math Vocabulary Octagon- a polygon with 8 sides

two lines, segments, or rays that intersect to form right angles Grade 4 Math Vocabulary Perpendicular- two lines, segments, or rays that intersect to form right angles

Grade 4 Math Vocabulary Point- A point or dot used to separate the whole number part from the fractional part of a number

Grade 4 Math Vocabulary Prime Number- a whole number that has exactly two factors, 1 and itself

Grade 4 Math Vocabulary Ray- a part of a line that has one endpoint and continues without end in one direction

a polygon that has all sides congruent and all angles congruent Grade 4 Math Vocabulary Regular Polygon- a polygon that has all sides congruent and all angles congruent

a triangle that has a 90 degree angle Grade 4 Math Vocabulary Right Triangle- a triangle that has a 90 degree angle

Grade 4 Math Vocabulary Scalene Triangle- three unequal sides

the second number in a subtraction sentence Grade 4 Math Vocabulary Subtrahend- the second number in a subtraction sentence

the price of a single item or amount (e.g., $3.50 per pound) Grade 4 Math Vocabulary Unit Price- the price of a single item or amount (e.g., $3.50 per pound)

a diagram that shows relationships among sets of objects Grade 4 Math Vocabulary Venn Diagram- a diagram that shows relationships among sets of objects

Grade 4 Math Vocabulary Vertex- a point where lines, rays, sides of a polygon or edges of a polyhedron meet (corner)

Grade 5 Math Vocabulary Axis- the horizontal number line (x-axis) and the vertical number line (y-axis) on the coordinate plane

the plane determined by a horizontal number line Grade 5 Math Vocabulary Coordinate Grid- the plane determined by a horizontal number line

Grade 5 Math Vocabulary Coordinate Plane- the plane determined by a horizontal number line, called the x-axis, and a vertical number line, called the y-axis, intersecting at a point called the origin

  Grade 5 Math Vocabulary Diameter- a line segment that has endpoints on a circle and passes through the center of the circle

the line where two surfaces meet Grade 5 Math Vocabulary Edge- the line where two surfaces meet

Numerical Expression- Grade 5 Math Vocabulary Numerical Expression- a mathematical phrase involving only numbers and one or more operational symbols

a triangle that has an angle greater than 90° Grade 5 Math Vocabulary Obtuse Triangle- a triangle that has an angle greater than 90°

Grade 5 Math Vocabulary Ordered Pair- a pair of numbers used to locate a point on a coordinate grid; the first number tells how far to move horizontally, and the second number tells how far to move vertically

Grade 5 Math Vocabulary Origin- the point on the coordinate plane where the x-axis and y-axis intersect (0,0)

  Grade 5 Math Vocabulary Parallelogram- a quadrilateral whose opposite sides are parallel and congruent

a solid object with two identical ends and flat sides Grade 5 Math Vocabulary Prism- a solid object with two identical ends and flat sides

the four regions of a coordinate plane that are separated by the axes Grade 5 Math Vocabulary Quadrant- the four regions of a coordinate plane that are separated by the axes

Grade 5 Math Vocabulary Radius- a line segment that has one endpoint on a circle and the other endpoint at the center of the circle

a solid figure in which all six faces are rectangles Grade 5 Math Vocabulary Rectangular Prism- a solid figure in which all six faces are rectangles

the line on a graph that runs horizontally (left- right) Grade 5 Math Vocabulary X-axis- the line on a graph that runs horizontally (left- right)

the line on a graph that runs vertically (up- down) Grade 5 Math Vocabulary Y-axis- the line on a graph that runs vertically (up- down)