Chapter 3 Review, Part 2

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!!!

Chapter 3 Review, Part 2

by Middle School on Oct 10, 2008

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