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A mathematical property stating that the order in which two numbers are added or multiplied does not change the result. For example, 1.3 + 8.2 = 8.2 + 1.3.

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Commutative Property

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A property of addition that states that you can group does numbers being added in different ways and not change their sum. For example, (a + b) + c = a + (b + c).

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Associative Property of Addition

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Numbers that are easy to compute mentally, often used to estimate the result of a calculation.

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Compatible Numbers

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The process of adjusting a number to a nearby and more convenient value (often referred to as "about how many").

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Round