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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.
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.