This Instructional Activity is a part of the Lesson 4, Unit 7, Grade 8. Students extend exponent rules to discover why it makes sense to define 10^0 as 1. Students create viable arguments and critique the reasoning of others when discussing Noah's argument that 10^0 should equal 0. Arrange students in groups of 2. Give students 5 minutes to answer the first 3 problems and a few minutes to discuss the last problem with a partner before a whole-class discussion.