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Chapter 1

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