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Chapter 2 Vocabulary

TermDefinition
reasonable something that makes sense
estimate a number that is close to the exact answer - an estimate indicates ABOUT how much
regroup to use place value to exchange equal amounts when renaming a number
round to change the value of a number so it is easier to work with
Associative Property the property that states that the GROUPING of addends does not change the sum
Communitive Property the property that states the ORDER of addends does not change the sum
Identity Property the property that states that if you add ZERO to a number the number will stay the same
parentheses symbols that are used to group numbers
pattern a sequence of numbers, symbols, or figures that follow a rule.
unknown missing number or the number to be solved for
mental math ordering or grouping numbers so they are easier to solve in your head.
Created by: Miss Saha
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