Students will learn how to convert between numbers, word form, and expanded form. Conclude by giving this challenge, which has no prereqs. This challenge is useful for showing objects can have many representations.
Intro to place value by Khan Academy
3-digit place value challenge by Khan Academy
Conclude by leading this investigation:
Building Skyscrapers of Different Heights
2.NBT.A.3: Read and write numbers to 1000 using base-ten numerals, number names, and expanded form.