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. 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. Class Notes
How to easily order fractions using cross-multiplication
42 45
5/6 is > 7/9
Order from least to greatest:
Last Example:
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
