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Chapter 1 Vocabulary Review

Across
To replace a number with another number that tells about how many or about how much.
Numbers that are easy to compute mentally.
The property that states that you can add two or more numbers in any order and get the same sum. 6+4=4+6
A number close to an exact number.
Down
The property that states that the sum of any number and zero is that number. 0+6=6
The property that states that when the grouping of addends is changed, the sum is the same. (3+6)+2=3+(6+2)
A repeating or growing sequence that follows a rule.