Explain multiplication. Show them you have five pieces of candy, and that if you have three groups, each with five pieces of candy, then you have 15 pieces of candy. Let the children count the candy, and then explain the process of arriving at 15: 15 pieces of candy is 5+5+5 or 5x3. You may try something a bit simpler than a 5 times table, but a few helpful examples make it much easier to teach multiplication.
Teach the tricks. Tricks make multiplication easier and more enjoyable. For example, 10 times tables are simple because you just add a zero to whatever number you multiply by 10. Times tables for 11 have a similar trick, in that you just repeat the number twice.
Play games. Use flashcards and play games with multiplication tables for prizes. Many websites have games that allow kids to practice multiplication, too. Games allow kids to learn at a more comfortable pace, and the practice speeds up the process of solving problems and helps children understand.
Review for a few minutes each day for a few weeks. Do this until the children's multiplication is fairly solid.
Review multiplication occasionally. This will ensure the kids don't forget what they learned.