1 2 Modeling Quantities Todays Target I will
- Slides: 14
1. 2 Modeling Quantities Today’s Target: I will be able to use rate, ratios and proportions to create scale drawings and models, convert measurements and determine lengths.
How much would 1 can of apple juice cost?
Once you know how much one costs, you can find the cost of any number of items. What would you need to do to figure out how much 7 eggs cost?
How much would 3 bottles of blackberry soda cost?
Unit Rate • A rate in which the denominator of the fraction is 1 unit. Ex: Miles per hour Cost per ounce Tickets per dollar
Find the unit rate. •
Vocabulary Ratio: a comparison of two numbers by division Proportion: an equation that states that two ratios are equal
Page 15 • A totem pole that is 90 feet tall casts a shadow that is 45 feet long. At the same time, a 6 -foot tall man casts a shadow that is x feet long. • The man and the totem pole are both perpendicular to the ground, so they form right angles with the ground. The sun shines at the same angle on both, so similar triangles are formed. Complete page 15 with your partner.
Using scale drawings and models to solve problems. . . • Scale: a ratio of any length in a scale drawing or scale model to corresponding actual lengths • Scale drawing: a drawing that uses a scale to represent an object as smaller or larger than the original object • Scale model: a three-dimensional model that uses a scale to represent an obect as smaller or larger than the actual object.
Page 16 • The actual distance from Chicago to Evanston is 11. 25 miles. What is the distance on the map? 1 in: 18 mi • Complete page 16 with your partner.
Using Dimensional Analysis to Convert Measurements •
Pages 17 - 18 • Use dimensional analysis to convert measurements: Complete page 17 with your partner. • Use dimensional analysis to convert and compare rates: Complete page 18 with your partner
Page 19 • Graphing a proportional relationsip: compete page 19 with your partner • When done be able form a conclusion about unit rates.
Homework • Due Monday, September 8 • Page 21 #1– 26 (Be sure to show the units of your proportion)