This is a 9 page supplemental activity packet for the 4.oa.4 common core standard that focuses on factors and multiples. The packet includes extra practice for students to use to lead them into deeper understanding and greater proficiency with the 4.oa.4 standard. These activities can be done at school or at home, in a learning center or with a small group. Most appropriate for grade 4 students but could also be used with 3rd or 5th graders. The packet includes a quiz to assesses mastery.