Got this linked to the source...I think :)

Snag this addition freebie! "Build it" cards have students practicing addition within 20 and showing their answers.

Counting on from any number math stations, worksheets, and activities that are super fun - Building Number Sense in First Grade

Magnet fishing - this could put some life back into the magnet center!

Miss Van Maren's Fantastic First Grade: BUILD Math Rotations

math centers based on B.U.I.L.D. (Kickin' it in Kindergarten)

Building number sense in first grade can seem daunting but with the right number sense activities and lessons, it can be a lot of fun! In th...

Numbers, patterns, counting, sorting... including FREE printable stars - from Rachel (",)

Build It! ~ TGIF! - Thank God It's First Grade!: More Math Stations and an Addition Freebie!

Miss Giraffe's Class: Fact Fluency in First Grade