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Learn multi-digit multiplication
and problem solving
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Math Mammoth Multiplication 2

70 pages
(55 lesson pages)
Price: $4.25 download

Buy printed softcopy
at Lulu - $10.95, b&w

Sample pages (PDF)

Contents & Introduction
Multiplying by Whole Tens and Hundreds
Multiply in Parts
Multiplying in Columns, Standard Way
Error of Estimation
Money and Change
Scales Problems
Multiplying 3-digit by 2-digit

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November 2011 - the PDF version of this book is now 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 Acrobat Reader version 9 or greater.

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).

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 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 digits.

You might also be interested in:

Math Mammoth Division 2—a worktext about long division, word problems, average, and divisibility (grades 4-5).
Math Mammoth Multiplication & Division 3—a worktext about multi-digit multiplication and long division with larger numbers, ratios, simple equations, divisibility, primes, and factoring (grades 5-6).
Make It Real Learning: Arithmetic I—an activity workbook with real-world data, focusing on situations that use addition, subtraction, estimation, division, bar graphs, and place value with large numbers (grades 3-6).

Better Yet - Package Deals!
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"Everything" Bundle - $240 (download only)

Learn more about these Math Mammoth bundles!

*BONUS*: Buy any bundle listed above, and get the fully upgraded Soft-Pak software with more features and options for FREE (includes 4 math, 1 language arts, 2 testing programs).

*BONUS* - SOFT-PAK MATH SOFTWARE

I bet you'd have to agree: this is a steal! You can get Soft-Pak math programs (list price $24.95) for just a small $3.50 s&h fee - just by ordering ANY of my books at Kagi or CurrClick!

* Math Maker, for printable math activities with answer keys
* Math Master, for on screen practice of various math topics
* Math User, for answering the 900 multi-level word problems
* True/False Math Challenger for mastering facts 1-12

NOTE: if you purchase any one of the Math Mammoth bundles at Kagi store, you will get Soft-Pak in the download or included on the CD for FREE.

Soft-Pak may also be purchased at great 75% discount without a Math Mammoth purchase - click here for details.

How and where to order

You can buy Math Mammoth books at:

Kagi store - all of the downloads and CDs. I maintain five different order pages at Kagi:
One for the Blue series,

another for the Golden and Green Series, and

third for the Light Blue complete curriculum products, and

one more for the Packages (CDs or downloads).

And yet an order page for Make It Real Learning workbooks.

Kagi accepts all major credit cards, Paypal (USD), checks, cash, money orders, purchase orders, wire transfers, TrialPay, and even cash. Read more about the payment methods here. Please see Kagi Shopper Help for any other questions about the ordering process.

After completing the order at Kagi, you will see the download links on the receipt page. You will also receive an email with download links for each book you bought, or for a zip file for the packages. You click on the links and download the books to your computer's hard drive.

In case of any problems with the download, you can always email me, and I can email the books to you directly. My contact info will be in the email you receive.

CurrClick.com carries all Blue, Golden, and Light Blue series books as downloads. They accept credit cards and Paypal. You will be able to download the products immediately upon the purchase, and also return to your account at CurrClick to redownload.

Lulu offers printed copies for the Blue, Golden, and Light Blue series books. You can also find links to Rainbow Resource on the individual product pages on this site.

Rainbow Resource carries printed copies for the Light Blue series books, plus the Light Blue CD. You can also find links to Rainbow Resource on the individual product pages on this site.

By purchasing any of the books, permission IS granted for the teacher (or parent) to reproduce this material to be used with his/her students in a teaching situation; not for commercial resale. However, you are not permitted to share the material with another teacher.

In other words, you are permitted to make copies for the students/children you are teaching, but not for other teachers' usage.

Math Mammoth books are PDF files. You will need Adobe Acrobat Reader to view them, including if you use a Mac or Linux. You can try other PDF viewers, but they seem to either omit or mess up some of the images.

Math Teaching Emails

This is a little "virtual" email course. You will receive:

A package of 300 free worksheets and sample pages; 7 math teaching articles on various topics ranging from coherent curriculum to fractions; 2 emails discussing the books; My math newsletter (see archives).

Note: You will FIRST get an email that asks you to confirm your email address. PLEASE check also your SPAM/JUNK folder for this confirmation email.

Math Mammoth Tour

Confused about the different options? Take a 7-day virtual email tour around Math Mammoth! You'll receive:

A package of over 300 free worksheets and sample pages; 7 individual emails on 7 subsequent days that answer the most commonly asked questions, including "What is the difference between all these different-colored series?" My math newsletter (see archives).

This way, you'll have time to digest the information over one week, plus an opportunity to ask me personally which book would be right for your child or students.

Note: You will FIRST get an email that asks you to confirm your email address. PLEASE check also your SPAM/JUNK folder for this confirmation email.