Subtracting Integers by "Walking It Out!'
Objective: SWBAT modeling subtraction of Integers on a horizontal number line.
Big Idea: Students will use a kinesthetic approach to learning how to model subtraction of integers using a horizontal number line.
Print Lesson
Bell Ringer
Bell Ringer (opening of lesson) Hand out Bell Ringer as students arrive in your class:
15 minutes
For this bell ringer, have the students grapple with each problem and come up with a strategy in which they can model the subtraction using the number line. This will lend itself to MP 1,2,4,5, and 6. Pair students up to grapple with the problems together. The ultimate goal here is to allow students the time to come up with the strategy on their own. Please see teacher guided notes for the examples given to help with students who may not be able to create a starting point.
Direct Instruction
Direct Instruction: 20 minutes
One strategy that is fun to use when helping students understand operations of positive and negative numbers on a number line is the “WALKING” strategy. This activity will get students up and active with their entire bodies. Use the notes below to teach your students the strategy. Have the students take notes on the strategy in their Interactive Math Journals. You may choose to print out the “teacher guided notes” in the resource section, or have students draw a number line for each example and hand write each example. This will be left up to you and the time you have to complete the lesson. This lesson should only take one day.
Teacher Guided Notes: These teacher guided notes were revised from the Columbus City Schools Curriculum Guide.
Student Practice:
Ok, now let’s let the students practice. This student practice will lend itself to MP 1, 2, and 4. Before you let them go off into their own groups to complete the student practice sheet, practice a few as a whole group. Choose 4 students to practice each example. You may use the examples given from the teacher guided notes. Have them use their created number lines to “walk out” each problem. You may also use equations of your own.
Have students use their large number lines to solve each problem from the student classroom worksheet. Please see the resource section of this lesson for a print out version. Also, print out the blank number lines to have students illustrate what they did. They can use stick figures for their person. Use the teacher guided notes to show how this should be done.
