Take your time. You don’t need to sit down and learn all of the multiplication facts at one time. In fact, this would be the worst way to learn. Choose a table and focus solely on that one. Take as much time as you need to master each one before moving onto the next one. Spend about 15-20 minutes each day studying flashcards or playing math games to master each multiplication fact. There are many multiplication math games with different themes that can be found online. For instance, if you really like dinosaurs, find one that uses dinosaurs to make learning more fun.
Addition is an operation in which one number is added to another number. When adding a series of numbers, there are some strategies that help simplify the addition process. One thing to remember is to group numbers to make tens. For example, when adding 2 + 7 + 8, you can add the 2 and the eight first to get ten, and then add the seven to get 17. Some teachers call these groups of numbers that add to ten, "friendly tens," since they make adding easier for the student.