This is my Expanded Notation of Decimals Notes and Activity for ISN. This set has notes on expanded notation in 2 forms (filled and outlined) for the left side of the ISN, an activity to practice the concept that can also be a math center, and 4 different sets of practice problems for the right side of the ISN. A key is included for the practice problems. This follows Math TEKS 5.2A and CCSS 5.NTB3. I hope you enjoy these notes and activity and find them useful!