All of these activities are to help your students develop fact fluency for those troublesome facts!
There's a few different activities/games. I like to use the resource sheet and have my students create their own flashcards to use for games or centers. I've attached a sheet where you can simply run-off the flashcards and they have to write the answer on the back. There is another type of flashcards/game in triangles. Students begin to see the relationship of the fact families while playing with partners or groups. Just cover one of the corners to find the factor or product. There is also some fun target practice drills where you can write in the numbers or have the students add random numbers. Finally, a simple, spin and write where students are writing the four related facts.
There is lots to choose from to give your students lots of chances to practice and put to memory those trickier facts.