Math Mammoth Add & Subtract 3

84 pages
(includes answers)

Sample pages (PDF)
Contents and Introduction
Add & Subtract Whole Hundreds
Completing the Next Hundred
Addition/Subtraction Connection
Regrouping Twice in Subtraction
Subtracting 3-Digit Numbers Mentally

---

Prices & ordering

PDF download $5.00

Buy download at Kagi

(credit cards, Paypal, check, cash, PO, wire transfer, money order; Kagi shopper help)

Buy download at Currclick

(credit cards, Paypal)

Printed copy $9.95, b&w

Buy printed book at Lulu

(credit cards, Paypal, PO)

---

Este libro en español

Math Mammoth Add and Subtract 3 has to do with adding and subtracting 3-digit numbers. The book is suitable to study after the student has learned to add and subtract with 2-digit numbers, and has learned numbers till 1,000. The goal is to teach the student to add and subtract both mentally and in columns within 0-1000.

Since students usually learn three-digit numbers in second grade, some of the topics in this book suit second grade, some suit third grade.

The first section of the book explores some mental math with three-digit numbers, and is suitable for second grade. We study adding and subtracting whole hundreds, whole tens, and ones within 0-1000, often comparing to similar problems within 0-100. In most of these lessons, the addition or subtraction is first illustrated with a visual model. You can use manipulatives instead, if you prefer.

The next part (the middle part) deals with adding and subtracting in columns with regrouping. If you want to follow the grade levels, these lessons are intended for both second and third grade this way: the lessons are for second grade, until the topics of regrouping twice in subtraction and regrouping over zero tens in subtraction, which are for third grade.

The processes of regrouping in addition and subtraction are first practiced using visual models, to ensure the student understands the concept (the "why"), and does not only learn the procedure (the "how").

Regrouping in subtraction with three-digit numbers includes three different cases:

1. Regrouping 1 ten as 10 ones, such as is needful for 546 − 229.
2. Regrouping 1 hundred as 10 tens, such as is needful for 728 − 441.
3. Regrouping two times (1 ten as 10 ones, and 1 hundred as 10 tens), such as is needful for 725 − 448.
4. Regrouping with zero tens, such as is needful for 405 − 278. Here, first we regroup 1 hundred as 10 tens, then 1 ten as 10 ones.

In the last section, the book includes addition and subtraction topics for third grade, starting with mental addition and subtraction. Through it all, students solve lots of word problems and practice some algebra in disguise, where they use a symbol or a ? for the unknown thing in the problem. We also study ordinal numbers, rounding and estimating, and order of operations.

Then we study the connection between addition and subtraction with bigger numbers, which also aims to help children think algebraically. Lastly, students get to practice their adding and subtracting skills in a practical way through reading a mileage chart and other types of graphs.

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.

Better Yet - Package Deals!
Blue Series - $95 (download) or $100 (CD)
Blue Series for grades 1-3 - $38 (download)
Blue Series for grades 4-6 - $57 (download)
Light Blue Series - $136 (download) or $141 (CD)
Light Blue Series for grades 1-3 - $68 (download)
Light Blue Series for grades 4-6 - $68 (download)
Golden/Green Series - $65 (download) or $70 (CD)
All Inclusive - $192 (download) or $197 (CD)
"Everything" Bundle - $272 (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 several order pages at Kagi:
  • The Blue Series
  • Golden and Green Series
  • Light Blue Series, US version
  • Light Blue Series, South African version
  • Make It Real Learning activity books
  • discounted Math Mammoth bundles (CDs or downloads)

  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.


• Rainbow Resource carries printed copies for the Light Blue series books, plus Light Blue CDs. 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 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.