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7 Cards in this Set

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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.

34.38-12.831=
Round to the nearest whole number.

34-13= 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