The Teacher Studio: Learning, Thinking, Creating: Mind Boggling Math! Cute idea: I'm going to see how I can adapt this for Algebra.
Noggle (number boggle) for Early Finishers
Addition and Subtraction Math Fact Boggle - free printable Boggle cards plus recording pages for your classroom from The Curriculum Corner
Live, Laugh, and Love to Learn: Add it up Math Boggle-I need a bigger classroom!
Make an "Add It Up" Math Boggle Board for Your Classroom - Teach Junkie
Make an Add It Up Math Boggle Board for Your Classroom - bulletin board