Geometry
Area
Area is the number of square units that cover a two-dimensional region, without any gaps or overlaps.
Variable
A variable is a letter that represents a number. You can choose different numbers for the value of the variable.
Coordinate Plane
The coordinate plane is a system for telling where points are.
Ratio
A set of numbers that associates two or more quantities.
Dot Plot
A dot plot is a way to represent data on a number line. Each time a value appears in the data set, we put another dot above that number on the number line.
Height
The height is the shortest distance from the base of the shape to the opposite side (for a parallelogram) or opposite vertex (for a triangle). We can show the height in more than one place, but it will always be perpendicular to the chosen base.
Term
A term is a part of an expression. It can be a single number, a variable, or a number and a variable that are multiplied together.
Absolute Value
The absolute value of a number is its distance from 0 on the number line.
Percent
A percent is a rate per 100. A percentage is an amount described by a rate per 100.
Histomgram
A histogram is a way to represent data on a number line. Data values are grouped by ranges. The height of the bar shows how many data values are in that group.
Parallelogram
A parallelogram is a type of quadrilateral that has two pairs of parallel sides.
Solution
The solution to an equation or inequality is the value(s) that make the equation or inequality true when substituted in for the variable.
Reciprocal
Dividing 1 by a number gives the reciprocal of that number.
Ratio Table
A table, composed of rows and columns, where each pair of numbers in the table represents a ratio. The ratios in the table are all equivalent to one another.
Mean
The mean is one way to measure the center of a data set. We can think of it as a balance point. For example, for the data set 7, 9, 12, 13, 14, the mean is 11.
Volume
The amount of space a three-dimensional objects takes up, measured in cubic units.
A comparison of two quantities, such as greater than, less than, greater than or equal to, or less than or equal to.
Opposite
Two numbers are opposites if they are the same distance from 0 and on different sides of the number line.
Equivalent Ratio
Two ratios are equivalent if there is a nonzero number that can be multiplied by both quantities in one ratio to equal the corresponding quantities in the second ratio.
The median is one way to measure the center of a data set. It is the middle number when the data set is listed in order.
For the data set 7, 9, 12, 13, 14, the median is 12.
Surface Area
The surface area of a polyhedron is the number of square units that covers all the faces of the polyhedron, without any gaps or overlaps.
Distributive Property
Multiplying a number is the same as multiplying its addends by the number, then adding the products.
Rational Number
A rational number is a fraction or the opposite of a fraction.
Unit Rate
The number of units of the first quantity in a ratio for every 1 unit of the second quantity. The unit rate is the numerical part of a rate.
Distribution
The distribution of numerical or categorical data tells you how many of each value or category there are in the data set. A distribution is often represented visually such as with a dot plot or a histogram.