Pre-Algebra Chapter 3
description
Transcript of Pre-Algebra Chapter 3
![Page 1: Pre-Algebra Chapter 3](https://reader033.fdocuments.us/reader033/viewer/2022061600/568161df550346895dd1f13e/html5/thumbnails/1.jpg)
Pre-Algebra Chapter 3
Decimals and Equations
![Page 2: Pre-Algebra Chapter 3](https://reader033.fdocuments.us/reader033/viewer/2022061600/568161df550346895dd1f13e/html5/thumbnails/2.jpg)
3.1 Rounding and Estimating
![Page 3: Pre-Algebra Chapter 3](https://reader033.fdocuments.us/reader033/viewer/2022061600/568161df550346895dd1f13e/html5/thumbnails/3.jpg)
3.1 Rounding and Estimating• 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
![Page 4: Pre-Algebra Chapter 3](https://reader033.fdocuments.us/reader033/viewer/2022061600/568161df550346895dd1f13e/html5/thumbnails/4.jpg)
3.2 Estimating Decimal products and Quotients
Estimate the product
![Page 5: Pre-Algebra Chapter 3](https://reader033.fdocuments.us/reader033/viewer/2022061600/568161df550346895dd1f13e/html5/thumbnails/5.jpg)
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 divisor2. Round the dividend to a compatible number
![Page 6: Pre-Algebra Chapter 3](https://reader033.fdocuments.us/reader033/viewer/2022061600/568161df550346895dd1f13e/html5/thumbnails/6.jpg)
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
![Page 7: Pre-Algebra Chapter 3](https://reader033.fdocuments.us/reader033/viewer/2022061600/568161df550346895dd1f13e/html5/thumbnails/7.jpg)
Examples 3.3Find the measures of central tendency for the following list of data:42, 59, 48, 50, 50 , 45 200
Mode:Median:Range:Outlier:Mean:
![Page 8: Pre-Algebra Chapter 3](https://reader033.fdocuments.us/reader033/viewer/2022061600/568161df550346895dd1f13e/html5/thumbnails/8.jpg)
3.4 Using FormulasA Formula is an equation that shows a relationship between quantities that are represented by variables.
![Page 9: Pre-Algebra Chapter 3](https://reader033.fdocuments.us/reader033/viewer/2022061600/568161df550346895dd1f13e/html5/thumbnails/9.jpg)
Examples 3.4
a. P=88.2 cm b. P = 52in
Think of peRIMeter as the distance around the “RIM” of a figure.
![Page 10: Pre-Algebra Chapter 3](https://reader033.fdocuments.us/reader033/viewer/2022061600/568161df550346895dd1f13e/html5/thumbnails/10.jpg)
3.5 Solving Equation by adding and Subtracting Decimals
Same as if you were solving equations by adding and subtracting integers.
![Page 11: Pre-Algebra Chapter 3](https://reader033.fdocuments.us/reader033/viewer/2022061600/568161df550346895dd1f13e/html5/thumbnails/11.jpg)
3.6 Solving Equations by multiplying or dividing Decimals
a) y÷(-3.9) = -55.99 b) 2.3x = -4.37
Same as if you were solving equations by Multiplying and Dividing integers.
![Page 12: Pre-Algebra Chapter 3](https://reader033.fdocuments.us/reader033/viewer/2022061600/568161df550346895dd1f13e/html5/thumbnails/12.jpg)
K ing H enry D ied by d rinking c hocolate m ilkilo
3.7 Metric System
eka
ecko
base
enti
illi
eci
Base Units: Meters, Grams, or Liters
![Page 13: Pre-Algebra Chapter 3](https://reader033.fdocuments.us/reader033/viewer/2022061600/568161df550346895dd1f13e/html5/thumbnails/13.jpg)
3.7 continued
![Page 14: Pre-Algebra Chapter 3](https://reader033.fdocuments.us/reader033/viewer/2022061600/568161df550346895dd1f13e/html5/thumbnails/14.jpg)
3.8 Problem Solving by Acting it out
![Page 15: Pre-Algebra Chapter 3](https://reader033.fdocuments.us/reader033/viewer/2022061600/568161df550346895dd1f13e/html5/thumbnails/15.jpg)
Underconstruction