The main strategies discussed in this lesson plan are breaking down multi-digit numbers into thousands, hundreds, tens, and ones, as well as utilizing the doubling and halving strategy.
Breaking down numbers into thousands, hundreds, tens, and ones helps simplify the process of multiplying large numbers by dealing with 'a lot of zeros'.
This lesson plan provides additional practice problems for students to reinforce the concepts learned. The problems cover various strategies such as partitioning, rounding and adjusting, and doubling and halving.