1. Pre-Algebra Chapter 3 Decimals and Equations

2. 3.1 Rounding and Estimating

3. 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

4. 3.2 Estimating Decimal products and Quotients Estimate the product

5. 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

6. 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

7. 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:

8. 3.4 Using Formulas A Formula is an equation that shows a relationship between quantities that are represented by variables.

9. Examples 3.4 a. P=88.2 cm b. P = 52in Think of peRIMeter as the distance around the “RIM” of a figure.

10. 3.5 Solving Equation by adding and Subtracting Decimals Same as if you were solving equations by adding and subtracting integers.

11. 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.

12. 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

13. 3.7 continued

14. 3.8 Problem Solving by Acting it out

15. Underconstruction