Build a 3-digit number from the parts

This activity reinforces students' understanding that a 3-digit number is composed of a hundreds digit, a tens digit, and a ones digit — helping them see number composition as a concrete, additive process.

Building a number from its parts is the inverse of writing expanded form — students who can do both demonstrate a complete understanding of place value decomposition and composition at the 3rd grade level.

Yes, building 3-digit numbers is a bridging skill that reinforces 2nd grade place value knowledge while setting up the 3rd grade extension to 4- and 5-digit numbers.