AIM: How can we use proportions to solve word problems?
HW: Ratio and Proportion Word Problem Worksheet #1-5, 14-17
Do Now: What is being compared in each statement below?
1) A pizza delivery guy can deliver 5 pizzas in 45 minutes. (pizzas to minutes)
2) The teacher grades 3 quizzes every 12 minutes. (quizzes to minutes)
3) Mr. Severiano drinks 17 fl. oz. of water every 53 minutes (fluid oz. to minutes)
Announcement: There will be a group quiz this Friday, 12/4/15 on Unit 3, Problems 1.1-1.4, 2.1 and 2.2.
Classwork: After discussing the Do Now reviewing answers to the homework for a student reflective period, we began with a model problem. "Roy's yard is covered with walnuts. He will pay you $2.50 for every 3 buckets of walnuts you pick up and put in the trash. How much will you make if you pick up 12 buckets of walnuts?" From this problem, students devised a series of steps to approach proportion word problems.
1. Write the proportion in word form.
2. Substitute known innformation into proportion.
3. Cross multiple OR use scale factor to solve for missing variable.
4. Check your work (by replacing back into proportion and checking for equality).
Students applied these steps for other related problems, including more difficult part-to-part ratios and part-to-whole ratios.
Document file for homework is found below.