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Vocabulary - Chapter 1

Across
A number that is added to another.
A number close to an exact number.
When the last digit of a number is 1,3,5,7, or 9, the number is ....
To put together (two or more numbers or amounts) to calculate their total value.
Numbers that are easy to compute mentally and are close to the real numbers.
Taking one number away from another.
When the last digit of a number is 0,2,4,6, or 8, the number is ....
Down
An ordered set of numbers or objects.
The _______ property of addition states that the sum of any number and zero is that number.
You can _______ a number to the nearest ten or hundred to find a number that tells about how much or about how many.
The _________ property of addition states that you ou can group addends in different ways and still get the same sum.
The ________ property of addition states you can add two or more numbers in any order and get the same sum.
The result of adding two or more numbers.
The result of a subtraction problem.