- Learn more
- Discounted Bundles
PDF download $3.50
Printed copy $8.95, b&w
Math Mammoth Decimals 1 is an introduction to decimal numbers, and is best suited for 4th to 5th grade math.
The PDF version of this book is enabled for annotation. This means that if you prefer, the student can fill it in on the computer, using the typewriter and drawing tools in Adobe Reader version 9 or greater.
This book deals with decimal numbers that have tenths and hundredths - numbers with a maximum of two decimal digits. We only deal with some of the basic operations: addition, subtraction, and multiplication by a whole number, with a strong emphasis on mental calculations. The idea is to lay a solid conceptual foundation so that the student does not succumb to rote memorization of rules and procedures without understanding.
The two operations not studied in this book are multiplying a decimal by a decimal and decimal division. Those can be found in Math Mammoth Decimals 2.
We use number lines, fraction models, and place value charts to teach the concepts of tenths and hundredths. In studying addition and subtraction, we compare decimal operations with corresponding fraction operations in order to show why they work.
A common student error is to add 0.4 + 0.8 = 0.12. Here, the student may be considering the decimal part of a number as a 'separate whole number', and try to apply whole number arithmetic within the decimal part. To help such a student, read the decimals as fractions and emphasize how fractions are added. Think: four tenths plus eight tenths equals twelve tenths, which is 1.2.
When we add decimals of different "length" (numbers with different amounts of decimal digits), such as 0.4 + 0.08, you can "tag" a zero onto the end of 0.4 to make adding easier. The problem becomes 0.40 + 0.08. Now, both addends have hundredths, so the answer is simply 48 hundredths or 0.48. This is the same thing as converting the corresponding fractions (four tenths and eight hundredths) to have the same denominator (forty hundredths and eight hundredths).
Other topics covered are comparing decimals, multiplying a decimal by a whole number, rounding, estimating, and money problems.
Several videos from my Decimal arithmetic playlist can be used in conjunction with this book.
From a homeschooling parent who has used Decimals 1 with a 5th grader:
My 5th grader and I worked through the decimals book. It actually helped me to understand decimals a lot better also. We were both amazed at how easy they are to work with once you understand the concepts behind them.
I love the books. They include a lot of thinking and reasoning skills that our other math program did not include. They also present things in a simple clear manner. No more tears when it comes to decimals!!!
Better Yet - Bundle Deals!Blue Series - $120 (download) or $125 (CD)
Blue Series for grades 1-3 - $45 (download)
Blue Series for grades 4-7 - $75 (download)
Light Blue Series, grades 1-7 - $175 (download) or $180 (CD)
Light Blue Series, grades 1-3 - $75 (download)
Light Blue Series, grades 4-7 - $100 (download)
Golden/Green Series - $65 (download) or $70 (CD)
All Inclusive Bundle - $233 (download) or $238 (CD)
"Everything" Bundle - $299 (download only)
Learn more about these Math Mammoth bundles!
You can buy Math Mammoth books at:
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 Tour
Confused about the different options? Take a 7-day virtual email tour around Math Mammoth! You'll receive:An initial email to download your GIFT of over 400 free worksheets and sample pages from my books; 6 other emails on 6 subsequent days that describe the different series of Math Mammoth products, answering the most commonly asked questions, including "What is the difference between all these different-colored series?"
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. If you cannot find this confirmation email, please check your SPAM/JUNK folder.
"Mini" Math Teaching Course
This is a little "virtual" 2-week course, where you will receive emails on important topics on mathematics education. The topics include:
Join over 25,000 others!
Maria's Math Tips is my email publication that comes out usually once a month. It's filled with math teaching resources, Math Mammoth news & discounts, humor, giveaways, and more! The content is equally good for all of us who teach math.
By subscribing you will also receive:
© 2006-2017 MathMammoth.com