Licensing information Users should treat this material as a working draft. This material can be used in its current form, customized, and/or printed or displayed by the user. The author(s) request feedback on all materials so that they can be continually improved and updated. This material is licensed under the Creative Commons Attribution-Share Alike license: (http://creativecommons.org/licenses/by-sa/3.0/). Author: Kevin Hall Wording for the legal statement above is adapted from the legal statement for Trigonometry, published in 2009 by The CK-12 Foundation: http://about.ck12.org/

Teaching notes These are NOT lecture notes. Students should try the questions on their own, before you show the answers. While they are practicing, you want to be walking around praising and prompting them. Before getting to class, be sure to print out the answers and have them handy. Otherwise you’ll be stuck solving the questions for yourself while they work, rather than walking around praising and prompting students. Using a remote mouse clicker, you can slowly display the answers. Time it so each answer appears soon after most students have finished that question.

÷ 2 ÷ ? ÷ 2 2). • ? • 6 3). A grade of 15/25 is what percent? • 4 3 questions right 18 questions right 60 = 15 x 7 questions total x = 42 25 100 • 6 • 4 X = 42 questions total 15/25 is 60% ÷ 2 6). In 3 minutes, you earned $4.50. On average, what did you earn per minute? 4). x 40 80 shots made = $4.50 $ 50 shots taken 100 shots taken = 1.50 min. 3 min ÷ ? ÷ 2 $1.50 X = 40 shots made $ 4.50 $1.50 $1.50 $1.50 ?? $ This picture is a hint 3 min. 1 min. Answer: You made $1.50 min.