Use flashcards. Make multiplication cards for each number set. Although this may seem tedious, the process of making the cards will actually help you to learn them. Once you’ve made them, spend some time each day studying until you know them all. Focus on one number set at a time. When you go through the cards, put the ones you get wrong back into the pile so you see them multiple times.
The steps for adding fractions can be very easy if the problem is set up properly. The fraction worksheets on this page have examples of problems that illustrate increasing levels of difficulty to build the skills needed to tackle any kind of fraction addition problem.