| Adding Integers Grade Level 8 Objective-------Use models and a number line to add integers and find zero pair. TEKS objectives------1A-compare and order rational number 1B-select and use apporpriate forms of rational numbers to solve real-life problems 2A-select and use appropriate operations to solve problems 2B-add, subtract, multiply and divide rational numbers Materials Needed-----Overhead Projector Michael Eaton Vocabulary Cards Two-Color Counters Index Cards Number Line Transparencies Number Line Attention Graber------Michael Eaton Vocabulary Cards 1. Absolute Value-The distance from a point on the number line to zero. 2. Opposite Integers-Two numbers represented by points on the number line that are the same distance from zero, but are on opposite sides of zero. Explanation of Zero Pair----What is zero pair? Two opposite integers that cancel each other out. Modeling/Providing Examples----Use two-color chips to model adding integers. The red side represents negative numbers and the yellow represent positive numbers. Use a number line to model adding integers. The students use handout with number lines already drawn out for them. Use absolute value to add integers. Group Activity----Students will make up two problems on index cards. They will then switch with their neighbor. The neighbor will work the two problems. They will then switch back and check the answers. Guided Practice----Have three students volunteer to come to the overhead and work out practice problems. Summarize/Review----Restate the three types of models used in today's lesson. Mini Quiz/Hots question----Have students number the second index card from 1 to 10. 1. What are the three different kinds of problems? 2. 3. 4. How do you know if the answer is neg. or pos. when adding neg. and pos. integers? 5. Show three possible problems adding a neg. and a pos. number together. And show the answer. 6. 7. 8. Find the sum: -8 + (-4) 9. Find the sum: 32 + (-8) 10. Find the sum: (-12) + 12 For each correct answer students will receive 1/2 points towards next chapter test grade. Independent Practice----Provide a worksheet with twenty problems over adding integers. If not completed students will finish for homework. (Provide baggies of whole punch dots so students can model their answers with all three different modles.) |