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You are here: Home → Blue Series → Decimals 1 Math Mammoth Decimals 1 Workbook![]() 78 pages (of which 56 are lesson pages) Price: $4.25 download Sample pages (PDF) Contents and Introduction Decimal Numbers - Tenths Adding Tenths Multiplying Tenths Adding Hundredths Comparing Rounding Math Mammoth Decimals 1 is a self-teaching worktext about decimal numbers. It suits best 4th and 5th grade in normal teaching. This ebook deals with decimal numbers that have tenths and hundredths - numbers with maximum of two decimal digits. The idea here is to lay a strong conceptual foundation in students' minds so that they can do the basic operations with these decimals mentally. Of the operations, the book deals with addition, subtraction, and multiplying by a whole number, with strong emphasis on mental calculations. Multiplying a decimal by a decimal is not presented in this book, and division is not dealt with at all. Why is that? The idea is to lay such a solid foundation that the student grasps the concepts and does not succumb to rote memorization of calculation rules without understanding. The two operations not dealt with in the book are multiplying a decimal by a decimal, and decimal division. These two operations are the ones that students often only memorize how to do them - and sadly also often forget a few years afterwards. Decimals 1 ebook uses number lines, fraction models, and place value charts - and makes the student draw them too - to teach the concepts of tenths and hundredths. Other topics covered are comparing decimals, adding and subtracting decimals both mentally and in columns, multiplying a decimal by a whole number both mentally and in columns, rounding, estimating, and money problems. If children cannot add decimals mentally, they may rely too much on adding in columns or on the calculator, without really understanding decimals. That is why in my book the student is often made to compare decimal operations with corresponding fraction operations. A common error is to add 0.4 + 0.8 = 0.12 etc.: children consider the decimal part of a number as a 'separate whole number' and try to apply whole number arithmetic within the decimal part. Emphasizing the equivalency to fractions and how fractions are added should help. The student should think of 0.4 as "four tenths" and 0.8 as "eight tenths", and then realize how twelve tenths is more than one, hence 0.4 + 0.8 = 1.2. The book also emphasizes how to add decimals of different "length". When adding one number with one decimal digit and another with two, for example 0.4 + 0.08, you will 'tag' a zero to the end of 0.4 so both addends will have same amount of decimal digits. This is the exact same thing as making the corresponding fractions to have the same denominator (denominators 10 and 100 are made to be 100 and 100). From a homeschooling parent who has used Decimals 1 with a 5th grader: Better Yet - Package Deals! *BONUS* - SOFT-PAK MATH SOFTWARE
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The books listed below are from the Blue Series (worktexts by topic) and the Green Series (worksheet collections by topic). If you are looking for full curriculum by grade, or for workbooks/worksheets by grade level, please click on the "Navigate by grade" tab.
Addition & Subtraction
Addition 1 worktext (grade 1)Place Value
Place Value 1 worktext (grade 1)Multiplication & Division
Multiplication 1 worktext (grade 3)Clock and Money
Clock worktext (grades 1-3)Measuring
Measuring 1 worktext (grades 1-3)Fractions
Introduction to Fractions worktext (grades 2-4)Decimals
Decimals 1 worktext (grades 4-5)Geometry
Early Geometry worktext (grades 1-3)Other topics
Integers worksheets (grades 5-6)Make It Real Learning
States by the Numbers series (grades 3-6)This is a little "virtual" email course. You will receive:
A package of 280 free worksheets and sample pages; 7 math teaching articles on various topics ranging from coherent curriculum to fractions; 2 emails discussing the books; Homeschool 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.
Confused about the different options? Take a 7-day virtual email tour around Math Mammoth! You'll receive:
A package of 280 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?" Homeschool 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.