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4th grade Math Terms

A-Z

By: Ms. Rebecca Morgan

ELE 4050

Spring 2012

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A is for Angle

• angle

• The union of two rays with the same endpoint.

• The rays are the sides and the common endpoint is called the vertex. There are many types of angles.

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A is for Acute Angle

• acute angle

• An angle whose measure is between 0° and 90º.

• We like to think of them as the "cute" tiny angles.

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A is for Addend

• addend

• A number to be added.

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B is for Bar Graph

• bar graph

• A graph in which information is represented using bars of various lengths to show values of a particular category.

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C is for Circle Graph

• circle graph

• A graph in which information is represented using a circle that is cut into sectors to show values of a particular category. Also called a pie graph.

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C is for Common Denominator

• common denominator

• A multiple of all the denominators in a problem.

• Ex: Given 1/2, 1/3, 1/4 one common denominator would be 12, because 2, 3, & 4 all divide into 12 evenly.24, 36, 48 etc. would also be common denominators but 12 is used most often because it is the smallest, or "least common denominator", and thus is easier to work with.

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C is for Congruent

• congruent

• Equal

• Example:

• Congruent angles means the same as equal angles.

• Congruent figures have the same shape and size.

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D is for Denominator

• denominator

• The divisor, or bottom number, in a fraction. b in the fraction a/b.

• Remember that a fraction is a division problem. The top number, the numerator, is the number being divided, the fraction bar is the division symbol, and the bottom number, the denominator, is the number of equal parts that you are dividing the top into.

• *If the numerator is greater than the denominator, the fraction is > 1.**If the numerator is less than the denominator, the fraction is < 1.

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D is for Dividend

• dividend

• The number in a quotient which is being divided; a is the dividend in a/b.

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D is for Divisor

• divisor

• The number by which you divide in a quotient; b is the divisor in a/b. Also a number that exactly divides into another number, referred to as a factor.

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E is for Equilateral Triangle

• equilateral triangle

• A triangle in which all the sides have the same length.

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F is for Fraction

• fraction

• A number written in the form a/b, where b is non zero.

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G is for Gallon

• gallon (gal)

• A unit of capacity in the U.S. system of measurement equal to 4 quarts.

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G is for Graph

• graph

• A picture of numbers on a number line or coordinate system.

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H is for Horizontal Line

• horizontal line

• A horizontal line is one which runs left-to-right across the page.

• In geometry, a horizontal line is one which runs from left to right across the page. It comes from the word 'horizon', in the sense that horizontal lines are parallel to the horizon.

The horizon is horizontal.

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I is for Isosceles Triangle

• isosceles triangle

• A triangle with two sides equal in length.

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J is for Justification

• justification

• A definition, postulate, or theorem which enables a conclusion to be drawn.

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K is for Kilo

• kilo

• A prefix meaning 1000.

• Example :

• 2 kilograms = 2000 grams

• 2 kilometers = 2000 meters

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L is for Line Symmetry

• line symmetry

• A figure is said to posses line symmetry if it can be reflected onto of itself over a given line.

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M is for Mean

• For example: To find the mean, or average, of 10, 9, 8, and 5 this is what you would do:

• mean

• A number that describes a set of other numbers. You get a mean, or average, as it is commonly called, by taking the sum of the numbers being examined and then dividing that sum by how many numbers were added.

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M is for Mode

• mode

• The number which appears most often in a data set.

• The mode of the following data set is 6 : 15, 6, 2, 6, 42, 6.

• It is possible to have more than one mode as in the set 1, 1, 3, 12, 4, 4. It is possible to have no mode if no values appear more than once as in the set 1, 2, 3, 4.

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N is for Numerator

• numerator

• a in the fraction a/b. Remember that a fraction is a division problem. The top number, the numerator, is the number being divided, the fraction bar is the division symbol, and the bottom number, the denominator, is the number of equal parts that you are dividing the top into.

• *If the numerator is greater than the denominator, the fraction is > 1.**If the numerator is less than the denominator, the fraction is < 1.

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N is for Net

• net

• A two-dimensional figure that can be folded on its segments or curved on its boundaries into a three-dimensional surface.

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O is for Obtuse Angle

• obtuse angle

• An angle whose measure is between 90° and 180°. Remember a 90° angle is called a right angle not an obtuse angle, and a 180° angle is called a straight angle not an obtuse angle.

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P is for Parallel Lines

• parallel lines

• Two lines in a plane are parallel if they have no points in common or are identical and they never intersect.

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P is for Place Value

• place value

• numbers that each digit stands for in a decimal.In the illustration below, if you think of the one's place and the decimal point as the center, the names correspond on either side. Remember, the numbers to the right of the decimal point always end in "ths".

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Q is for Quadrilateral

• quadrilateral

• A four-sided polygon.

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Q is for Quadrant

• Quadrant

• One of the four parts into which the coordinate plane is divided by the x-axis and y-axis. Quadrants are labeled with Roman Numerals as shown below.

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Q is for Quotient

• Quotient

• The result of dividing one number by another

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R is for Right Angles

• right angle

• An angle whose measure is 90°. A right angle will always be drawn with a small square at its vertex.

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S is for Scalene Triangle

• scalene triangle

• A triangle with no two sides of the same length.

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T is for Triangle

• triangle

• A polygon with three sides.

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U is for “U.S System of Measurement”

• U.S system of measurement

• A measurement system in common use in the United States today, based on inches and pounds. Also called the customary system of measurement.

12 inches =1 foot

36 Inches = 1 yard

5,280 feet = 1 mile

1 square mile = 640 acres

8 ounces = 1 cup

2 cups = 1 pint

2 pints = 1 quart

4 quarts = 1 gallon

16 ounces = 1 pound

2,000 pounds = 1 ton

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V is for Vertex

• Vertex

• (plural vertices) The point two sides of a polygon have in common. The point of intersection of the sides of an angle.

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W is for Whole Number

• whole number

• Any of the numbers 0, 1, 2, 3, ... .

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X is for X-axis

• x-axis

• The horizontal (left to right) number line in a coordinate graph. The line in the coordinate plane or in space, usually horizontal, containing those points whose second coordinates (and third, in space) are 0.

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X is for X-Coordinate

• x-coordinate

• The first coordinate of an ordered pair or an ordered triple.

• Ex: in the coordinate pair

(3,-8), the three is the x-coordinate.

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Y is for Y-axis

• y-axis

• The vertical (up and down) number line in a coordinate graph. The line in the coordinate plane, usually vertical, or in space, containing those points whose first coordinates (and third, in space) are 0.

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Y is for Y-Coordinates

• y-coordinate

• The second coordinate of an ordered pair or ordered triple

• Ex: in the coordinate pair (3,-2), the negative two is the y-coordinate.

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Z is for Zero Angle

• zero angle

• An angle whose measure is zero.

• There is still a vertex.

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Resources

• http://www.themathlab.com/dictionary/awords/awords.htm