In this lesson, students examine absolute value as an operation. First, students interpret the meaning of absolute value of a number in situations. Then students find the values of expressions including absolute value by recognizing absolute value’s place in the order of operations. In the associated Algebra 1 lesson, students work toward writing absolute value as a piecewise function. Students are supported by recalling what they know about absolute value as an operation from grade 6 before expanding on their understanding of absolute value as a function.
Students must look for and make use of structure (MP7) when they use order of operations with absolute value.
Lesson overview
- 14.1 Warm-up: Math Talk: Closest to Zero (10 minutes)
- 14.2 Activity: What is Absolute Value? (10 minutes)
- 14.3 Activity: Absolute Value Expressions (20 minutes)
Learning goals:
- Recall that absolute value of a number is its distance from zero on the number line.
- Recognize absolute value’s place in order of operations.
Learning goals (student facing):
- Let’s investigate absolute values.
Standards:
- This lesson builds on the standard: CCSS.6.NS.C.7.cMS.6.NS.7cMO.6.NS.C.7
- This lesson builds towards the standard: CCSS.HSF-IF.C.7.bMS.F-IF.7bMO.A1.IF.C.7
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