FIFTH GRADE MATH VOCABULARY
Array - A rectangular arrangement of objects in rows and columns.
Cluster - A group of related math problems. (Example: 2x5, 40x5, 42x5, 20x5, 42x10)
Composite Number - A whole number greater than one with more than two different factors. For example, 6 is a composite number. Its factors are 1, 2, 3, and 6.
Coordinate Grid – two crossed number lines that are called x-axis(horizontal) and y-axis (vertical)
Data - Set of information.
Decagon – A figure with ten sides.
Decimal – A number with a dot separating the ones and tenths places in the base ten system
Denominator - It shows the number of equal parts into which the whole has been divided. (Example: In 2/5, 5is the denominator)
Difference - The answer to a subtraction problem.
Dodecagon – A figure with twelve sides.
Equilateral triangle - A triangle with equal sides and equal angles.
Estimation - To find an approximate answer for a problem.
Even number - A whole number ending with 0, 2, 4, 6, or 8 in the ones place.
Factor - Any number that when multiplied by another number, gives you a product (The product is the answer to a multiplication problem). Example:
4 x 6=24, therefore, 4 is a factor of 24 and also 6 is a factor of 24.
Factor Pairs - Two numbers that when multiplied together give you a product. One factor pair of 18 is 2 x 9.
Factor tree - A method of breaking down a multiplication problem into its prime factors. For example:
4 x 3
2 x 2 x 3
Fraction - A fraction names an equal part of a whole or a part of a group. (Example: 2/5)
Grid - A pattern of evenly spaced horizontal and vertical lines that form squares.
Hendecagon – A figure with eleven sides and eleven angles.
Heptagon – A figure with seven sides and seven angles.
Hexagon - A figure with six sides and six angles.
Horizontal axis - Horizontal lines that run from top to bottom that forms a graph.
Integers - A whole number that can be positive or negative.
Line Plot - A way to organize numerical data; shows the range of data and how the data are distributed over that range.
For example this is the line plot for this set of data: 2, 3, 4, 4, 4, 5, 7, 7, 7, 8.
X X X X X X
2 3 4 5 6 7 8
Linear measurement - The measurement of a line. For example length, width and height are linear measurements of a box.
Median - The number in the middle of a group of numbers arranged in order from least to greatest.
Multiple - Numbers formed by multiplying a number by a whole number. The multiples of 3 are 0, 3, 6, 9, 12, 15 etc.
Multiple Tower – A tower built by listing the multiples of a particular number until the tower is as tall as the person building it.
Nonagon – A figure with nine sides and nine angles.
Number Sense - Having a deep understanding of the relationships between numbers.
Numerator - In a fraction, it shows how many of the equal parts of a thing are taken. (Example: In 2/5, 2 is the numerator.
Octagon – A figure with eight sides and eight angles.
Odd number - A whole number ending with 1, 3, 5, 7, or 9 in the ones place.
Parallelogram - A quadrilateral with opposite sides equal in length and parallel.
Pentagon – A figure with five sides and five angles.
Polygon – A closed plane figure formed from line segments that meet only at their endpoints.
Predict - To tell what you think will happen.
Prime - A number that has only one and itself as factors. Prime numbers for example would be 2, 3, 5, 7, 11, etc
Quadrilateral – A four-sided polygon
Ex: square, rectangle, trapezoid, parallelogram, rhombus
Quotient - The number obtained by dividing one number into another. (The answer to a division problem.) Example: In 32 divided by 8=4, the number 4 is the quotient.
Range: The difference between the greatest number and the least number in a group of numbers.
Rectangle: Four-sided figure with four right angles and opposite sides equal.
Regular Polygon – A multi-sided figure with all sides equal in length.
Skip Counting - Counting by a certain number for example 3, 6, 9, 12,etc.
Solution - An answer to a problem.
Square - A special rectangle with all sides equal and four right angles.
Square number - The result of multiplying a number by itself. (Example: 4x4=16)
Statistics - Facts about a particular subject that are collected and arranged in the form of numbers.
Strategy - A plan or system of how to solve a problem.
Sum - The answer to an addition problem (example: 1+2=3)
Trapezoid - A figure with four sides, only two of which are parallel.
Triangle - A figure with three sides and three angles.
Equilateral triangle – A triangle with equal sides and equal angles.
Isosceles triangle - A triangle with two equal sides.
Obtuse triangle – A triangle with one angle greater than 90 degrees.
Right triangle – A triangle with one right angle or one angle equal to 90 degrees.
Scalene triangle - A triangle with no equal sides.
Vertical axis - Vertical lines that run from left to right that form a graph.
Whole number - Any number that is not a fraction. (Example: 0, 1, 2, 3, 7 and 12 are whole numbers, 4 ¾ is not.