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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.

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### Chapter 3 Review, Part 2

1. 1. Chapter 3 Review, Part 2 By Ms. Dewey-Hoffman October 8 th , 2008
2. 2. Section 3.5: Solving Equations by Addition or Subtraction Decimals. <ul><li>Get the variable by itself… </li></ul><ul><li>By undoing what is happening to the variable. </li></ul><ul><li>To undo something, you must do the opposite to both sides. </li></ul><ul><li>B – 7.12 = 12.12 </li></ul><ul><li>B is being subtracted by 7.12, so to undo it, we must add 7.12 to both sides. </li></ul>
3. 3. Example Problems: Solving Decimal Equations by Undoing with Addition and Subtraction <ul><li>-10 = c – 2.6 </li></ul><ul><li>y – 14.4 = 18.39 </li></ul><ul><li>g + 4.5 = -9.7 </li></ul>
4. 4. Solving Equations Word Problem <ul><li>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. </li></ul>
5. 5. Section 3.6: Solving Equations by Multiplication or Division of Decimals. <ul><li>Get the variable by itself… </li></ul><ul><li>By undoing what is happening to the variable. </li></ul><ul><li>To undo something, you must do the opposite to both sides. </li></ul><ul><li>But with Decimals. </li></ul>
6. 6. Example Problems <ul><li>r/-6.0 = 0.5 </li></ul><ul><li>-80 = t/4.5 </li></ul><ul><li>0.8x = 0.448 </li></ul><ul><li>-0.5y = -0.73 </li></ul>
7. 7. Section 3.7: Metric System <ul><li>Convert from one unit to another. </li></ul><ul><li>Basic Units are: Liters, Meters, and Grams </li></ul><ul><li>Units bigger than Basic Units: </li></ul><ul><li>Kilo-, Hecto-, and Deka- </li></ul><ul><li>Units smaller than Basic Units: </li></ul><ul><li>Deci-, Centi-, and Milli- </li></ul>
8. 8. 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-
9. 9. Section 3.8: Reasoning Strategy: Breaking Problems Down <ul><li>Remember: make word problems into simpler problems. </li></ul><ul><li>12 Players, turn it into a 4 Player problem. </li></ul><ul><li>Figuring out digits? Make the digits smaller to figure out the larger problem. </li></ul>
10. 10. Word Problem 1: <ul><li>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? </li></ul>
11. 11. Word Problem 2: <ul><li>The houses on your street are numbered 1 to 120. No numbers are skipped. How many house numbers contain at least one digit 5? </li></ul>
12. 12. Assignment #22 <ul><li>Pages: 166: 32 – 55 All. </li></ul>
13. 13. Chapter 3 Extra Credit <ul><li>Page: 167: All. </li></ul><ul><li>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. </li></ul>
14. 14. Put Everything Else Away… <ul><li>All you need is a pencil or pen for… </li></ul><ul><li>Staircase!!! </li></ul>