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An angle with a measure less than 90°. 


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To combine, put together two or more quantities 


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Problems that ask how much more (or less) one amount is than another. 


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A stepbystep method for computing. 


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Two rays that share an endpoint. 


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The measure of the size of an angle. It tells how far one side is turned from the other side. A one degree angle turns through 1/360 of a full circle. 


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Part of a circle between any two of its points. 


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The measure, in square units, of the inside of a plane figure. 


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A model of multiplication that shows each place value product. 


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An arrangement of objects in equal rows. 


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Associative Property of Addition 

Definition
Changing the grouping of three or more addends does not change the sum. 


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Associative Property of Multiplication 

Definition
Changing the grouping of three or more factors does not change the product. 


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A characteristic of an object, such as color, shape, size, etc. 


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Fractions that are commonly used for estimation. 


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Capacity refers to the amount of liquid a container can hold. 


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A metric unit of length equal to 0.01 of a meter. 


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A plane figure with all points the same distance from a fixed point called a center. 


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To sort into categories or to arrange into groups by attributes. 


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For two or more fractions, a common denominator is a common multiple of the denominators. 


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Commutative Property of Addition 

Definition
Changing the order of the addends does not change the sum. 


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Commutative Property of Multiplication 

Definition
Changing the order of the factors does not change the product. 


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To decide if one number is greater than, less than, or equal to. 


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To put together components or basic elements. 


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A number greater than 0 that has more than two different factors. 


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Having exactly the same size and shape. 


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A customary unit of capacity. 1 cup = 8 fluid ounces. 


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A system of measurement used in the U.S. The system includes units for measuring length, capacity, and weight. 


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A collection of information gathered for a purpose. Data may be in the form of either words or numbers. 


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A number with one or more digits to the right of a decimal point. 


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A number containing a decimal point. 


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A dot (.) separating the whole number from the fraction in decimal notation. 


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To separate into components or basic elements. 


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A unit for measuring angles. Based on dividing one complete circle into 360 equal parts. 


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The quantity below the line in a fraction. It tells how many equal parts are in the whole. 


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Any of the symbols 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9. 


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The amount that remains after one quantity is subtracted from another. 


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When one of the factors of a product is a sum, multiplying each addend before adding does not change the product. 


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To separate into equal groups and find the number in each group or the number of groups. 


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A number that is divided by another number. 


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The number by which another number is divided. 


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A point at either end of a line segment, or a point at one end of a ray. 


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