## Reflection: Rigor Khan Academy on Positive and Zero Exponents - Section 2: The Assessment

This particular exercise is extremely straight forward and might not seem like it could take a whole lesson, but I find that it presents some interesting challenges for students. For example, they will get problems like 9^3. I ask students to explain how they could solve this mentally. This mental arithmetic conversation should extend to all the problems in the set. Having the ability to see 9 x 9 = 81 and then 9 x 81 = 9 x (80 + 1) represents incredible number sense. These types of problems are a chance to talk about the associative, commutative and distributive properties.

I also like this activity because it leaves room for questions like, "why is 2^0 = 1?" Watch how students deal with these problems and give them feedback. See what strategies they use and then open this up to a class discussion.

How long to spend on this learning activity?
Rigor: How long to spend on this learning activity?

# Khan Academy on Positive and Zero Exponents

Unit 11: Law and Order: Special Exponents Unit
Lesson 3 of 17

## Big Idea: Students need as many opportunities to practice and reflect

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Subject(s):
Math, Scalars, positive exponents, Exponents, khan academy, properties of exponents, Math 8, exponentiation, Laws of Algebra, skill development, zero exponents, flipped classroom
60 minutes

### Shaun Errichiello

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