Catalyst – January 6(4), 2013 HOW OUT! Grab a CALCULATOR 1. A car averages 27 miles per gallon. If gas costs $4.04 per gallon, which of the following is closest to how much the gas would cost for this car to travel 2,727 typical miles? A. $  44.44 B. $109.08 C. $118.80 D. $408.04 E. $444.40 When x = 3 and y = 5, by how much does the value of 3x2 – 2y exceed the value of 2x2 – 3y ? F.   4 G. 8 H. 16 J. 20 K. 50 What is the value of x when 2x + 3 = 3x – 4 ? A.  –7 B.  -1/5 C.   1 D.  1/5 E.   7

Today’s Agenda Catalyst Error/Percent Error Practice Problem 3 HW Questions? Quiz Stats, Return, and Mastery Tracking New Notes! Dimensional Analysis! Work Time! Exit Question

Error and Percent Error Key Point #3: Error and percent error are both ways to describe the accuracy of a measurement. Error = Estimate – Actual Value % Error = Error x 100 Actual

Error and % Error Example 3 Henry Heavyfoot was just arrested for speeding by Officer O'Rourke for traveling 65 mph in a 55 mph zone. Henry claimed his speedometer said 55 mph, not 65 mph. What is the error and percent error of Henry’s speedometer?

Quiz 1 Class Grade Averages 1st Period: 71.8% 2nd Period: 82.0% 4th Period: 80.8%

Quiz 1 Champs 1st Place (102): Lionel Greer, Jr. (2nd period) 2nd Place (101): Kara Francois (1st period) 3rd Place (100): TraMichael Louis (2nd period)

Quiz 1 Champs: Honors 1st Place (104): Ashley Bran 2nd Place (99): Aldren Wilson 3rd Place (94): Ashley Lavine, Peyton Zimmermann, Abby Richmond, Tiffany Dalmado

Resume – Mastery Tracking! Count up the number of points you got correct for each GLE by looking at the questions for that GLE Look at each question’s point value (usually 5 points) Calculate percent mastery for each GLE and for your overall average mastery using this formula: Your Points/Total Points Possible x 100

SWBAT write conversion factors for metric units. Today’s Objectives SWBAT write conversion factors for metric units. SWBAT solve 1-step unit conversions using dimensional analysis.

LESSON TITLE: DIMENSIONAL ANALYSIS (CONVERSIONS)

CONVERSIONS GET READY FOR AWESOME!

Conversion Factors Key Point #1: Conversion factors are used to convert or go from one unit of measurement to another. YOU ALREADY KNOW THIS STUFF! Examples: 10 dimes= 1 dollar 20 nickels= 1 dollar 4 quarters= 1 dollar

Conversion Factors on Blast! Key Point #2: Conversion factors can be written in 2 ways… As a fraction that is equal to the number 1 As an equivalent

Two Ways to Write CFs Fraction Equal to 1 Equivalent __1 m = 1000 mm __1 hg = 100 g 100 g 1hg 100 g = 1 hg 1 hg = 100 g __1 L = 109 nL 109 nL 1L 1 L = 109 nL 109 nL = 1 L

Dimensional Analysis Key Point #3: Dimensional analysis is a tool used to convert from one unit to another. It relies on accurate conversion factors.

Working on the Railroad Step 1: What to what? Step 2: Write conversion factor(s) Step 3: Train Tracks Aka Math Set-Up

Practice! One-step problems. How many meters are in 10 centimeters? How many centimeters are in 327 meters?

Exit Question Write the conversion factor between the following units: centigrams and grams.

Catalyst – January 5(5), 2013 HW OUT PLEASE! Write a response to the following questions… What do you think about 3-D TVs and movies? What do you think is the FUTURE of 3-D technology?

Today’s Agenda Catalyst/Future Friday 1-Step Practice/Metric Olympics 2-Step Notes Work Time Group/Student of the Week! Exit Question

SWBAT solve1-step and 2-step conversions using dimensional analysis. Today’s Objectives SWBAT solve1-step and 2-step conversions using dimensional analysis. SWBAT CONVERT IT LIKE IT’S HOT!

Conversion Factors Review KP #1: Conversion factors are used to convert or go from one unit of measurement to another. YOU ALREADY KNOW THIS STUFF! Examples: 10 dimes= 1 dollar 20 nickels= 1 dollar 4 quarters= 1 dollar

Conversion Factors on Blast! Review KP #2: Conversion factors can be written in 2 ways As a fraction that is equal to the number 1 As an equivalent

Two Ways to Write CFs Fraction Equal to 1 Equivalent __1 m = 1000 mm __1 hg = 100 g 100 g 1hg 100 g = 1 hg 1 hg = 100 g __1 L = 109 nL 109 nL 1L 1 L = 109 nL 109 nL = 1 L

Dimensional Analysis Review KP #3: Dimensional analysis is a tool used to convert from one unit to another. It relies on accurate conversion factors.

Working on the Railroad Step 1: What to what? Step 2: Write conversion factor(s) Step 3: Train tracks

Volume - Liters < < 1 mL 1 L 1 kL

Mass - Grams . < < 1 mg 1 g 1 kg

Length - Meters . < < 1 mm 1 m 1 km

Practice! One-step problems. How many meters are in 10 centimeters? How many centimeters are in 327 meters?

Practice! On your own! Example Problem: A roll of Christmas gift wrap contains 2.5 meters of paper. What is the length of the paper in yards?

Worksheet Review 1-5

Always remember… Key Point #4: In two step problems, always convert to the unit without a prefix first. Mass: grams Distance: meters Volume: liters