Link to Zearn.org. All students have a personal username & password.
Multiplication & Division Fact Practice
23 Multiplication Apps for Kids: Disclaimer: I haven't tried all of these apps. Let me know which you like!
Multiplication.com (both games & self-correcting quizzes)
Mathisfun.com (both games & self-correcting quizzes)
Math-aids.com (if you want to create printable worksheets)
Scholastic Study Jams (great mini lessons on a variety of math concepts)
Khan Academy (amazing website for teaching & practicing all math standards that coincides perfectly with our Eureka math curriculum)