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# Math Mammoth Multiplication & Division 3

67 pages

## Prices & ordering

Printed copy \$8.55

Este libro en español

Math Mammoth Multiplication & Division 3 focuses on multi-digit multiplication and long division on the 5th grade level. This means the book is not meant for the initial teaching of those algorithms, but for practicing them with more digits than in 4th grade when students initially learned them. The book also contains lessons that aim to develop the student's algebraic thinking.

We start out with a little bit of mental math and a lesson on the order of operations. The lesson “Equations” focuses on the concept of equation as containing two expressions separated by an equals sign.

The lesson titled “Review: Multiplication and Division” emphasizes the connection between multiplication and division, and how we can use that connection to solve simple equations.

Then, students study partial products in two lessons. This process is very handy for mental math. The lessons tie in partial products with an area model and the distributive property. Students also see how partial products are the basis for the standard multiplication algorithm.

Next, students review the standard multiplication algorithm (multi-digit multiplication) and practice using it with 5 and 6-digit numbers. They also review 2-by-2-digit multiplication and extend that skill to 4-by-2-digit and 3-by-3-digit multiplication problems. All along the lessons also include estimation problems and word problems.

Then it is time to review the long division algorithm from fourth grade, and to extend it to divisions with two-digit divisors. Students also work on division problems that can be done with mental math, such as 600 ÷ 30, and learn why long division works, based on repeated subtraction.

The lessons for long multiplication often ask the student to estimate the answer before calculating. The lessons for long division ask for the student to check the answer by multiplying. Both of these methods serve the same purpose: to help them gauge whether the calculation is correct. Too often, students simply calculate something and hurry on by, without paying attention to their own work. We need to foster in them a sense of carefulness with calculations, and the habit of checking one’s own work for accuracy. If necessary, assign less problems (especially similar calculations) so that students have time to think about and check their answers.

The book ends in a review lesson.

The PDF version of this book can be filled in on a computer, phone, or tablet, using the annotation tools found in many PDF apps. See more.

• In this link, you can find videos that match the lessons in this book.
• Also, you can make additional worksheets for long multiplication and long division on this web page. Scroll down to the multiplication and division sections.

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 2—a worktext about multi-digit multiplication, order of operations, estimation, and word problems (grade 4).
• 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 - Bundle Deals!

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

## How and where to order

You can buy Math Mammoth books at:

• Here at MathMammoth.com website — simply use the "Add to cart" buttons you see on the product pages.
• Rainbow Resource carries printed copies for the Light Blue series books, plus several CDs (Light Blue and Blue series).
• Homeschool Buyers Club offers download versions of the Light Blue series, plus the Blue series bundle.
• Homeschool Planet sells the digital versions of the main curriculum and lesson plans to go with them.
• Lulu sells printed copies for most of the Math Mammoth materials (various series).

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. I recommend you use Adobe Reader to view them, including if you use a Mac. You can try other PDF viewers, but they may at times either omit or mess up some of the images.
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