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Line up decimals when rounding

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look at the decimal to see which place it is in

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Line up decimals

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make sure to bring down decimal point

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line it up correctly

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you can check your answer with adding

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reversing effect

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Inverse operations

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2+3=5 5-3=2

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opposite

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associative property

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the way in which grouped numbers does not change the sum

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(A+B) + C = A + (B+C)

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commutative property

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order of numbers that are added does not change the sum

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3+2 = 2+3

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C+C= F

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L+L=X