Question

how do you write 100 and 203 in expanded

Answer 1

Hey! =) Glad you have asked!
This is for 100:
100
  00
 + 0
100

And then for 203, this is how it would look like:

200
  00
+  3
203
I hope that this would have helped you! =)
Have an awesome day! =)

Answer 2

So lets write this out together. 

100 = 100 ( It will just be like that because the rest are all zero's)

203 = 200+ 3