The 1% Benchmark
Lesson 3 of 15
Objective: SWBAT solve percent problems using the 1% benchmark
This lesson begins similarly to the lesson The 10% Benchmark. I need to make sure students can easily divide any number by 100. I have an anchor chart for the students to refer to. It gives a short explanation of how to divide by 100 simply by moving the decimal point. Some students will need to be reminded where the decimal point is on a whole number! I will cold call students; I'll say a number and they must divide it by 10. For example, "I'll say 450" then I'll provide a brief wait time for all students to solve it, then I'll call a name from my set of cards. Students should respond quickly.
We will then work through an example problem and questions that ask student to summarize how to find 1% of a number and how to use this benchmark to find any percent.
Note: Some students may choose to find 3% of a number by adding the 1% value 3 times. Others may choose to multiply the 1% value by 3. Either way is fine with me.
Guided Problem Solving
Students now work through several problems. I expect most students to rely on the 1% benchmark, but I will not complain if they choose to use combinations of 1% and 10%. When we review the answers, I will make sure to show the variety of ways students solved problems: using addition of 1% values, multiplication of 1% values, and using combination of 1% and 10%.
Independent Problem Solving
Students work on a set of problems independently. The same comments that apply to the guided problem section apply to this section - students may solve these in a variety of ways.
I have included a mad minute section. I am going to use this after we go over the first 4 independent practice problems. I will probably allow students 2-3 minutes to complete as many of these problems as possible. I especially look forward to seeing how many students were able to solve #10 and #16 (0.5% and 1.5% respectively.
Before we begin the exit ticket we will summarize. How can you find 1% of any number? How can you use 1% of a number to find any other percent of that number?
Students then solve 3 multiple choice items followed by 1 explanation problem. Problem 4 will be worth 2 points. 4 out of 5 points will represent a successful exit ticket. I will accept answers that use only work and little to no words as long as I can clearly see the process:
1% of $75 = $0.75 times 3 --> 3% of $75 = $2.25