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commutative property of addition

If the order of the terms changes, the sum stays the same.

difference

the answer to a subtraction problem

Compatible Numbers

Numbers that are close to the given numbers that make estimation or mental calculation easier.

appropriateness

what you are looking for when you round a number

round

go the the nearest given place value; underline, look behind, the circled number tells you where to go.

reasonable estimate

you find this if you do not need an exact answer

Estimate

round

exact answer

you find this when solve a problem using the actual numbers given

associative property of addition

When the grouping of terms changes, the sum stays the same.

Identity Property of Addition

The sum of 0 and any number is that number.