Multiplication 2 covers multi-digit multiplication and related topics. The focus is on multi-digit multiplication. We learn the important concept of multiplying in parts. This essentially means that 4 × 63 is done in two parts: 4 × 60 and 4 × 3, and the results are added. The whole algorithm of multiplication is based on this principle, so it is important to master it.
Other lessons in this book practice estimation and order of operations, and multiplying with
money. Many kinds of word problems abound.
The lesson "So Many of the Same Thing" could be entitled "Proportional Reasoning" but I
wanted to avoid scaring parents and children with such a high-sounding phrase. The idea in
that lesson is really simple, but it does prepare for proportions as they are taught in 7th grade
and in algebra.
After that, we multiply by whole hundreds in order to prepare for double-digit multiplier
problems, and to understand the algorithm of multiplication with... More > more digits.< Less