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Math Vocab for Fourth Graders

in a mathematical sentence, this is a symbol used to represent an unknown number or a number that varies (hint: it is usually represented by a lowercase letter) variable
to rewrite a fraction as an equivalent fraction with a smaller numerator and denominator, (to put a fraction in simplest form) simplify
the difference between the greatest number and the least number in a set range
a solid three-dimensional shape with two identical parallel bases, and all other faces formed by rectangles or parallelograms prism
lines going in the same direction that are always the same distance apart, these never meet or cross parallel lines
the number found by dividing the sum of a set of numbers by the number of addends (this is also known as the AVERAGE) mean
a unit fraction representing one of one hundred equal parts, this is written as 1/100 hundredths
the amount of time that passes from the start of an activity to the end elapsed time
used to show position in a coordinate plane or map. An example is (1,3) coordinates
a face of a three-dimensional polyhedron by which the figure is measured or classified (a cylinder or cone has a circular one of these) base
the transformation of a figure by moving it without turning or flipping it in any direction (hint: fancy word for a slide) translation
a triangle with no equal sides (all lengths are different) scalene
the distance from the middle of a circle to any point on the circle (half the diameter) radius
a number greater than 1 that has exactly 2 factors (it only has a factor of 1 and itself) prime number
a number less than 0, but not a fraction or a decimal (it uses a negative sign) negative integer
a triangle with two congruent sides (2 sides are the same length) isosceles
one or more numbers, variables, or numbers and variables, with one or more operations. ex: (12-4) + 3 expression
the height, length, or width or a figure or object (The term 3-D is used to describe objects with three of these) dimension
numbers that have three or more factors composite number
a real or imaginary reference line, it can be horizontal or vertical axis
a unit fraction representing one of a thousand equal parts of a whole, it is written 1/1000 thousandth
the turning of a figure around a given point rotation
any quarter of a plane divided by an x and y axis (this forms a quarter of a circle) quadrant
the value of a digit as determined by its place in a number, an example of this is the tens place place value
the number that occurs most frequently in a set of data mode
lines that meet at a point, these look like an X intersecting lines
to find the approximate value or measurement of something (you can do this to guess how many marbles are in a jar) estimate
the distance across a circle through its middle, it is the longest chord of a circle diameter
a number divisible by all of the denominators of a set of fractions being considered (the number 30 is this for 1/6 and 1/15) common denominator
an addition and multiplication rule stating that no matter how numbers are grouped, the answer will always be the same (3 + 2 is the same as 2 + 3) associative property
a unit fraction representing one of ten equal parts of a whole, it is written as 1/10 tenth
the transformation of a figure by reflecting it over a line, creating a mirror image of the figure (sometimes called a flip) reflection
that chance that a particular outcome will occur probability
lines that lie on the same plane that intersect to form right angles perpendicular lines
the number in the middle of a set of data arranged in order from least to greatest or greatest to least median
a shape that has equal sides equilateral
a number system based on 10 decimal system
the distance around a circle circumference
a number to be added to another addend
Created by: fritzsar