Doubling and halving, tripling and thirding and even more. I think that this strategy is quick, simple and easy! It is a great way to solve complicated multiplication. The best part is that it is a great strategy to use in the future. I like the way you double one number, and halve the other in order to get a solution. However, you can get frustrated when the numbers get bigger. Overall this strategy is and awesome way to solve problems.
S.R Room 12.