Lesson Plan : Absolute Value

Teacher Name:
 Ellie Long
Grade:
 Grade 9-10
Subject:
 Math

Topic:
 Solving Equations Involving Absolute Value
Content:
 Absolute is the distance from the number to zero on the number line; it is always positive or zero.
Goals:
 Solve equations involving absolute values. Determine if a statement is sometimes, always, or never true.
Objectives:
 1)Student should be able to solve two or three equations independently and get two vlues of solution except the zero solution.
Materials:
 Prentice Hall Algebra 1; overhead projector and computer projector
Introduction:
 ex 1) |x| = 6 produces two vlues of solution; one is x = 6 and the other is x = -6. Why ? |+x| = 6 and |-x| = 6, that is, x can be measured from either positive or negative side on the number line.
Development:
 Draw a number line idicating +x, 0, -x, and distance of 6 from +x and -x. Model ex 2) |x| + 2 = 12, show x = 10 or x = -10, then check both answers. Model ex 3) 3|b| - 4 = 2, show x = 2 or x = -2.
Practice:
 I demonstrate difficult homework P.146, 17) 5 + |x| -9 = 2 (6,-6), 32) 1/4 + 1/2|x| = 5/8 (3/4, -3/4) 59) |2a + 1| = 5 (2, -3) 79) The sum of two consective even integers is 94. What are the integers ? (46,48)
Accommodations:
 Work together in the whole class by calling different level of students: Low level problems are 54) ~ 56). High level problems are 60) ~ 65).
Checking For Understanding:
 80% of the students should be able to complete the independent practice.
Closure:
 Look the sign in front not in the back; ask students the Error Analysis 67) 4 - 3x = 5 3x = 9 x = 3.
Evaluation:
 50% of the students should be able to complete the above Accomodation problems.
Teacher Reflections:
 Students can help each other or ask me for homework problems, but they can not copy each other's work. They can correct quizzes, tests, or graded assignments to get 3 points back on each corrected problem in class.

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