These 18 task cards are aligned with the fourth grade Common Core standards. They practice the goal "Gain familiarity with factors and multiples" within the Operations and Algebraic Thinking Domain. These are perfect for an independent center, partner work, early finishers, and math journaling. Just cut, laminate, and attach with a binder ring! Task cards will help you spiral back and review concepts. An answer key is included for a self-checking feature.