8.EE.1 
1. Know and apply the properties of integer exponents to generate equivalent numerical expressions. For example, 3^2 × 3^–5 = 3^–3 = 1/3^3 = 1/27.
Discovery ActivityUse your resources.

Think about exponents...What is an exponent, really? It is just another lazy mathematicians trick for showing repeated multiplication of the same number (base). Sometimes we forget what we are taught is a shortcut and never truly understand what we are learning. That's why the good math teachers typically hear this in their classrooms...

Why do we have to write this all out? 
Lesson: Multiplying and Dividing like bases


IXL  Exponents and roots: Multiplication with exponents
Until 100 
IXL  Exponents and roots: Understanding negative exponents80 or Higher

IXL  Exponents and roots: Evaluate negative exponents80 or higher

IXL  Multiplication and Division with exponents

IXL  Division with exponents

Lesson: Zero power and the incredible super power!

