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Pre-Algebra Chapter 3 Decimals and Equations
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3.1 Rounding and Estimating
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Rounding to Estimate: Round to same place value before estimating Front-end Estimation: Add front numbers before you estimate the remaining digits Clustering Estimation: if all numbers are clustered around the same number round and multiply by the number of items in list
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3.2 Estimating Decimal products and Quotients Estimate the product
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3.2 Estimating Decimal products and Quotients Estimate the Quotient by using Compatible numbers. Compatible numbers are numbers that are easy to divide mentally 1.Round the divisor 2.Round the dividend to a compatible number
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3.3 Mean, Median, & Mode Mean: is the sum of the data values divided by the number of data values. *Hint Average Mode: is the data item that occurs most often in the list. *Hint MOde = MOst Median: is the middle number when the numbers are listed in numerical order. *Hint Middle Range: is the difference between the greatest and lowest numbers in the set of data Outlier: is a data value much greater or less than the other data values. *Hint it affects the mean
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Examples 3.3 Find the measures of central tendency for the following list of data: 42, 59, 48, 50, 50, 45 200 Mode: Median: Range: Outlier: Mean:
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3.4 Using Formulas A Formula is an equation that shows a relationship between quantities that are represented by variables.
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Examples 3.4 a. P=88.2 cm b. P = 52in Think of peRIMeter as the distance around the “RIM” of a figure.
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3.5 Solving Equation by adding and Subtracting Decimals Same as if you were solving equations by adding and subtracting integers.
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3.6 Solving Equations by multiplying or dividing Decimals a) y÷(-3.9) = -55.99b) 2.3x = -4.37 Same as if you were solving equations by Multiplying and Dividing integers.
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K ing H enry D ied by d rinking c hocolate m ilk iloilo 3.7 Metric System ekaeka eckoecko basebase entienti illiilli ecieci Base Units: Meters, Grams, or Liters
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3.7 continued
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3.8 Problem Solving by Acting it out
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Underconstruction
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