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7 Cards in this Set
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 Back
Define Commutative Property.
Give and example. 
Definition: The order of the addends does not change the sum.
example: 3 + 4 = 4 + 3 

Define associative property.
Give an example. 
The way the addends are grouped does not change the sum.
example: (12 + 8) + 48 = 68 or 12 + (8 + 48) = 68 

Define Identity property.
Give an example. 
The sum of any number and 0 equals the number.
example: 5 + 0=5 and 0+5=5 

Estimate the following by rounding.
645+252= 
600 + 300 = 900 Rounded to the nearest whole number (hundreds)
also: 650 + 250 = 900. This is more difficult. 

Estimate with Decimals.
Estimate this number. Round to the nearest whole number. 34.3812.831= 
Round to the nearest whole number.
3413= 21 

What is important to remember when adding or subtracting decimals?
ex: 2.9 1.71 _____ 
The decimal point must be lined up in the sum and write an equivalent decimal if necessary.
ex: 2.90 1.71 _____ 1.19 

Define or give an example or an algebraic expression.

a mathematical phrase made of numbers and variables.
example: w + 15 = for w = 1 