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5th grade math vocabulary

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acute angle   an angle with a measure of less than 90 degrees  
obtuse angle   an angle with a measure greater than 90 degrees and less than 180 degrees  
horizontal axis   a reference line from which distances or angles are measured horizontally in a coordinate system  
vertical axis   a reference line from which distances or angles are measured vertically in a coordinate system  
base   the side of a polygon that contains one end of hte altitude  
composite   a number that has more than two factors  
cube   1) a regular solid with six square faces 2) the third power of a number  
determine   to settle or decide by an authoritative or conclusive decision  
decompose   to separate into components, parts, or basic elements  
dimension   the lengths of sides of a geometric figure  
divisible   one number is divisible by another number if their quotient is an integer  
evaluate   to find the value of a mathematical expression  
greatest common factor (GCF)   the largest number that divides evenly into two or more numbers  
height   the length of a perpendicular line segment from a vertex to the opposite side of a plane figure  
least common multiple (LCM)   the smallest common multiple of a set of two or more numbers  
line graph   a graph that uses a line to show how data change over time  
mean   a number found by dividing the sum of two or more addends by the number of addends, often referred to as the average  
prime number   a number that has exactly two different positive factors, itself and 1  
origin   the intersection of the x and y axes in a coordinate plane, described by the ordered pair (0,0)  
scale (axis)   a system of marks at fixed intervals used in measurement or graphing  
symmetry   when one half of an image is the mirror image of the other half  
thousandths   the value of a digit three places to the right of the decimal  
equilateral triangle   a triangle with all sides the same length  
isosceles triangle   a triangle that has at least 2 congruent sides  
obtuse triangle   a triangle whose largest angle measures greater than 90 degrees  
right triangle   a triangle that has one 90 degree angle  
scalene triangle   a triangle that has no congruent sides  
value   a numerical quantity measured or assigned or computed  
variable   1) a quantity that can have different values 2) a symbol that can stand for a variable  
volume   the number of cubic units it takes to fill a solid  


   


 

 

 

 

 

 
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