Addition and Subtraction strategies

In class we re-capped on addition and subtraction strategies. I created this video on strategies I know and learned. here is my video⬇️ <iframe width=”480″ height=”300″ frameborder=”0″ src=”https://www.educreations.com/lesson/embed/49888076/?s=OL5KLY&amp;ref=embed” allowfullscreen></iframe>

Place Value

We have been learning about place value. Here is a video showing  what I know about 5 digit numbers. Could you tell me what 10000 less than the biggest number in my video is, explain how you know in a comment!