This lesson is optional because it revisits below gradelevel content. If the preunit diagnostic assessment indicates that your students know this material, this lesson may be safely skipped.
In this lesson, students review exponent rules that they developed in grade 8 where the exponents in question are integers. In upcoming lessons, students use these exponent rules to connect radical expressions with rational exponents.
Students look for and make use of structure when they analyze the exponents in expressions to decide whether they are equivalent (MP7). Students analyze repeated division to extend the definition of exponents from positive integers to all integers (MP8).
Lesson overview
 1.1 Warmup: Which One Doesn’t Belong: Exponents and Equations (5 minutes)
 1.2 Optional Activity: Name That Power (10 minutes)

1.3 Optional Activity: The Power of Zero (15 minutes)
 Includes "Are you Ready for More?" extension problem
 1.4 Optional Activity: Matching Exponent Expressions (15 minutes)
 Lesson Synthesis
 1.5 Cooldown: The Power of Negative Thinking (5 minutes)
Learning goals:
 Comprehend why the properties of exponents hold for positive integers.
 Generalize from repeated reasoning to see how exponent properties help us extend the definition of exponents from positive integers to all integers.
Learning goals (student facing):
 Let’s use integer exponents.
Learning targets (student facing):
 I can evaluate expressions with integer exponents.
Standards:
 This lesson builds on the standard: CCSS.8.EE.A.1MS.8.EE.1MO.8.EEI.A.1
 This lesson builds towards the standards: CCSS.HSNRN.A.1MS.NRN.1CCSS.HSNRN.A.2MS.NRN.2MO.A2.NQ.A.1MO.A1.NQ.A.2
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