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15 Cards in this Set
 Front
 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 