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### 15 Cards in this Set

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• Back
 variable a letter used to represent a number zero property of additon if you add zero to any number the sum is that number 7+0=7 parenthesis ( ) in math means do what is inside these first commutative property of addition the quality of additon that states that the order of the addends does not change the sum 3+4=4+3 number sentence a statement showing how nbumbers in an operation are related. addends numbers that you add in addition estimate adding or subtracting rounded numbers sum answer in addition open sentence a number sentence that contains a variable x+6=10 difference answer in subtraction rounding changing the number to the nearest 10, 100, 1000, etc inverse operation the opposite operation: the opposite of addition is subtraction algebra an area of math that uses variables or letters to represent numbers inverse of addition subtraction associative property of addition the property of addition that states that the way you group the addends does not change the sum 1+(2=3)=(1+2)+3