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# September 9, 2013

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### September 9, 2013

1. 1. 9 September Today: Reminders, Other Notes Formulas Warm-Ups: Test & Sample Khan Academy Questions Order of Operations Class Work: Handout; Various Problems Odd/Even
2. 2. Updates/Info. Khan Academy Topics for September 15, 2013—7:00 pm  Writing Expressions 1  Writing Expressions 2  Writing & Interpreting Decimals Topics for all of September posted at the blog: (v6math.blogspot.com) As of yesterday, 24 people have already registered at Khan Academy. Thank you for doing that—116 to go.
3. 3. Formulas 1. Distance Formula: D = rt; where r = rate (speed) and t = time 3. Area of a Square: Since each side is the same length, P = 4S 2. Perimeter of a Square: If you drive for 2 ½ hours and average 50 miles per hour, how many miles have you driven? If you drive 120 miles in 2 ½ hours, what is your average speed? A 150 mile trip at 60 mph, would take how long? Area = LxW, but since each side is the same length, we are multiplying a number times itself. So the formula is: Area of a square = S2
4. 4. Class Notes How to easily order fractions using cross-multiplication 42 45 5/6 is > 7/9 Order from least to greatest: Last Example:
5. 5. Class Notes
6. 6. Step 1. Move the 6 by adding to right side. Step 2. Multiply both sides by 3 Write an expression to represent: Three less than three times a number x. Evaluate when y = 3 and x = 5: 2x2 + 4y Warm-Up
7. 7. From Khan Academy; Writing Expressions 2 Warm-Up
8. 8. From Khan Academy; Writing Expressions 2 Warm-Up
9. 9. Handout; Various Problems Odd/Even: Based on the date of your birth, (Your Birthday) Class Work