Chapter 3 Review, Part 2
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Chapter 3 Review, Part 2

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Chapter 3 Review, Part 2, October 8th Notes. Metric System, Reasoning Strategies, and One-Step Equations with Decimals.

Chapter 3 Review, Part 2, October 8th Notes. Metric System, Reasoning Strategies, and One-Step Equations with Decimals.

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Chapter 3 Review, Part 2 Chapter 3 Review, Part 2 Presentation Transcript

  • Chapter 3 Review, Part 2 By Ms. Dewey-Hoffman October 8 th , 2008
  • Section 3.5: Solving Equations by Addition or Subtraction Decimals.
    • Get the variable by itself…
    • By undoing what is happening to the variable.
    • To undo something, you must do the opposite to both sides.
    • B – 7.12 = 12.12
    • B is being subtracted by 7.12, so to undo it, we must add 7.12 to both sides.
  • Example Problems: Solving Decimal Equations by Undoing with Addition and Subtraction
    • -10 = c – 2.6
    • y – 14.4 = 18.39
    • g + 4.5 = -9.7
  • Solving Equations Word Problem
    • You spent $14.95 for a new shirt. You now have $12.48. Write and solve an equation to find how much money you had before you bought the shirt.
  • Section 3.6: Solving Equations by Multiplication or Division of Decimals.
    • Get the variable by itself…
    • By undoing what is happening to the variable.
    • To undo something, you must do the opposite to both sides.
    • But with Decimals.
  • Example Problems
    • r/-6.0 = 0.5
    • -80 = t/4.5
    • 0.8x = 0.448
    • -0.5y = -0.73
  • Section 3.7: Metric System
    • Convert from one unit to another.
    • Basic Units are: Liters, Meters, and Grams
    • Units bigger than Basic Units:
    • Kilo-, Hecto-, and Deka-
    • Units smaller than Basic Units:
    • Deci-, Centi-, and Milli-
  • Metric System Deka  Deci Deci  Milli Hecto  Unit Kilo  Deka 9 6 8 5. 8 6 9 2 5 0. 7 3 0. 8 2 4 3 1. 0.001 0.01 0.1 1.0 10.0 100.0 1000.0 Milli- Centi- Deci- Unit Gram Liter Meter Deka- Hecto- Kilo-
  • Section 3.8: Reasoning Strategy: Breaking Problems Down
    • Remember: make word problems into simpler problems.
    • 12 Players, turn it into a 4 Player problem.
    • Figuring out digits? Make the digits smaller to figure out the larger problem.
  • Word Problem 1:
    • A rancher wants to built a fence for a square lot with dimensions of 50 yards by 50 yards. He wants to install a fence post every 5 yards. How many fence posts will he need?
  • Word Problem 2:
    • The houses on your street are numbered 1 to 120. No numbers are skipped. How many house numbers contain at least one digit 5?
  • Assignment #22
    • Pages: 166: 32 – 55 All.
  • Chapter 3 Extra Credit
    • Page: 167: All.
    • This is also good practice for the test. If you can do the correct steps to each section then you are on your way to a good score on the midterms.
  • Put Everything Else Away…
    • All you need is a pencil or pen for…
    • Staircase!!!