Third Grade Common Core Math 3 OA.6 - Division As An Unknown-Factor Problem 3.OA.6 PDF3rd Grade Common Core Math 3 OA.6 Division As An Unknown-Factor Problem 3.OA.6 Practice provides two ways for students to practice and show mastery of their ability to understand division as an unknown-factor. Now with an Easel Activity and 2 Easel Assessments!It includes 40 distinct problems in 4 assessments (2 multiple choice test or quiz and 2 fill-in the blank), with answer keys for all 4 assessments. The P