Contents & Introduction
Multiplying by Whole Tens and Hundreds
Multiply in Parts
Multiplying in Columns, Standard Way
Error of Estimation
Money and Change
Multiplying 3-digit by 2-digit
Math Mammoth Multiplication 2 covers multi-digit multiplication and many other related topics. The student should already know multiplication tables before starting this book. While the first lessons briefly review the multiplication concept and the times tables, the focus is on multi-digit multiplication (also called algorithm of multiplication, or multiplying in columns).
The PDF version of this book is enabled for annotation. This means that if you prefer, your student can fill it in on the computer, using the typewriter and drawing tools in Adobe Reader version 9 or greater.
We start out by multiplying by whole tens and hundreds. After this is mastered, comes the very 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. I don't want kids to multiply in columns "blindly", without understanding what is going on with that algorithm.
Before showing the traditional form of multiplying in columns, the lesson Multiply in Columns - the Easy Way shows a simplified form of the same, which is essentially just multiplying in parts. You may skip that lesson at your discretion or skim through it quickly if your child is ready to understand the standard form of the algorithm, which comes next.
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 titled 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 digits.
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