Math: Algebra: Inequalities 23&24 I
These Drones Save Lives! STUDENT HANDBOOK, PAGE 68
Objective: Students will write ranges as inequalities and graph them on number lines to represent different situations associated with using drones. 1 Warm-Up: • Ask students what they know about drones. • Ask students to list tasks that drones might be used for. • On the floor of your classroom or on the board, display or draw a large blank number line with no tick marks. • Tell students that the average middle-school class size in most states is fewer than 32 students. • Write 0 and 32 as the anchors for the number line. Give all students a sticky note and have them write down what they think the most common average class size is for select states. Have them place their sticky notes at the corresponding values on the number line. • Then ask: What do you notice? (The markings are all to the left of the number 32.) • Tell students that this is an example of an inequality. An inequality often has many possible solutions instead of one exact solution. • In this lesson, they will learn how to write and graph inequalities. 2 Read: First, read aloud the first paragraph of “These Drones Save Lives.” Then ask students to predict how they think drones will save lives. Have students jot down their responses. Tell students they can use the title, images, what they have already read, and their own experiences to make their predictions. You may continue reading the article aloud or ask students to read with partners or independently. After the class has read the entire article, have students review their predictions to see if they are correct, and allow volunteers to share them with the group. (Make Predictions) 3 Guided Practice: Instruct students to look at the “Graphing Ranges” box on page 69 of the student handbook. Direct students to the chart. • Discuss and review the symbols, meanings, word clues, and graphing symbols of the four inequality types. Explain the difference between “less than” and “less than or equal to.”
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