This is a simple template I use with my first graders to give them support as they learn the pattern of three digit numbers. The booklet is set up with more scaffolding in the beginning and weens them off as they progress through to 1000. I've used this with both Investigations in Numbers and Space as well as Everyday Mathematics. My students keep their "Number Book" in the back of their Everyday Math Journal. We sometimes use these as a center, and students also use their Number Book if they finish early. The complete product is a nice formative assessment and great to share with parents.