Build, read, write (in standard and expanded form ... If you have 10 ones, it looks like this. This is a 10. If you have 10 tens, it looks like this, this is a hundred. And if you have 10 ...

Build, read, write (in standard and expanded form), and represent four-digit numbers using base-10 blocks and symbols. Compare numbers based on meanings of the thousands, hundreds, tens, and ones ...