Put numbers together and taking them apart with expanded form.

Practice time! Build, read, & write three-digit numbers using base-10 blocks and symbols. Practice time! Build, read, write (in standard and expanded form), and represent three-digit numbers using ...

--Heinemann, a division of learning technology company Houghton Mifflin Harcourt, today announced the expansion of its catalog of resources for teaching mathematics with a new curricular offering ...