Learning Multiplication Tables | Help for Struggling Students Finish with ten facts from 6 x 6 to 9 x 9. Patterns may help to learn many of the facts. These patterns are: Multiply by 2: Double the number (i.e., add it to itself). Example: 2 x 5 = 5 + 5 = 10. Multiply by 4: Double the number, then double the answer. Example: 4 x 5 = (5 + 5 = 10) and (10 + 10 = 20) Multiply by 5: The answer always ends in ...