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Rounding examples Round the following number to the nearest tenth. 1.-345.79 2.45.14 3.6.3499 4.3.953

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Algera I Section 3.6 Solving Decimal Equations

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A. Round-Off Error: When using math that doesn’t give exact answers, you will be asked to round the answer. This often leads to errors. 1.After you have rounded, use the ≈ sign rather than the = sign. 2.Example: Three people want to share equally in the cost of a pizza. The pizza costs $12.89. You can find each person’s share by solving 3x = 12.89.

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3. Example. Solve -38x – 39 = 118. Round to the nearest hundredth Now plug the number back into the equation to see if the answer is reasonable.

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Examples

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HW: Pg 169 1,6,8,14-38even pg 172: 1-10all

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