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Level 384

Addition & Subtraction of Decimals

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commutative property of addition
If the order of the terms changes, the sum stays the same.
the answer to a subtraction problem
Compatible Numbers
Numbers that are close to the given numbers that make estimation or mental calculation easier.
what you are looking for when you round a number
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
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.