Expressions Vocabulary

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Associative Property

Back

Different pairs of numbers can be grouped when adding or multiplying. Example: (2+3)+4=2+(3+4) ; (2×3)×4=2×(3×4)

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Commutative Property

Back

Numbers can be added or multiplied in ANY ORDER. Example: 3+5=5+3 ; 4×6=6×4

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Distributive Property

Back

Each term inside parentheses can be multiplied by the number outside the parentheses. Example: 3×(2+4)=3×2+3×4

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Identity Property

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The sum of a number and zero is the number; the product of a number and 1 is the number. Example: 5+0= 5; 8x1= 8

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Inverse Property

Back

The sum of a number and its opposite is 0; the product of a number and its reciprocal is 1. Example: 6+(−6)=0 ; 7× 1/7=1

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Equivalent

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Equal; when two values are the same. Example: 2+3=5 and 4+1=5

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Expression

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A mathematical phrase with numbers, variables, and operators. Example: 2x+5

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Base

Back

In an expression with an exponent, the base is the number being multiplied by itself. Example: In 3^4, 3 is the base, and it is being multiplied by itself 4 times: 3×3×3×3=81

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Exponent

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Determines the number of times the base is multiplied by itself. Example: In 5^3, 3 is the exponent, meaning that 5 is multiplied by itself three times: 5×5×5=125.

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Variable

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An unknown quantity represented by a letter. Example: In the equation x+2=5, x is the variable, representing an unknown value