Kennedy's Critters

Topic 2

Vocabulary

Commutative (Order) Property of Addition - Numbers can be added in any order and the sum will be the same.

Identity (Zero) Property of Addition - The sum of any number and zero is that same number.

Associative (Grouping) Property of Addition - The grouping of addends can be changed and the sum will be the same.

addends - numbers added together to give a sum

sum - the answer to an addition problem

round - to replace a number with a number that tells about how much or how many to the nearest ten, hundred, thousand, and so on.

estimate - to give an approximate number or answer.

compatible numbers - numbers that are easy add, subtract, multiply or divide mentally.

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