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Math Mammoth Add & Subtract 2-B - within 0-100.

73 pages
(of which 57 are lesson pages)
Price: $4.25 PDF download

Buy printed hardcopy
at Lulu - $11.05, b&w

Sample pages (PDF)
Contents & Introduction
Adding Whole Tens
Carrying To Tens
Going Over to the Next Ten
Two-Digit Numbers Ending in 8
Regrouping, part 2
Mental Subtraction
Review

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In Math Mammoth Add & Subtract 2-B, the student adds and subtracts mentally and in columns within 0-100. The emphasis is on learning how to carry when adding in columns, and how to borrow when subtracting in columns. These concepts are explained in detail visually, including lots of picture exercises.

This book is a continuation to the book Add & Subtract 2-A.

The book starts with mental math - adding and subtracting whole tens. Then come lessons about adding in columns - first with easy numbers without carrying, and then carrying, which is illustrated and explained in detail with the help of pictures.

After column-adding comes a section of mental adding once again. In it, the child adds a single-digit number to a 2-digit number, but this time the sum goes over the next ten. This concept is studied with pictures, and comparing it to the addition of single-digit numbers.

The next lessons teach subtracting in columns. First we only look at the easy problems where you don't need to regroup (or borrow).

The next lessons practice in detail the process of borrowing or regrouping. You can use either term with your child, or even choose not to use either if you feel it is confusing. It is good enough to just talk about 'breaking a ten into ten ones'.

First, the lesson Regrouping practices breaking down a ten into ten ones in cases where there aren't enough ones to do the subtraction. It is crucial that the child understands what happens here. Otherwise, he/she might end up learning the borrowing procedure only as a memorized algorithm and will probably at some point misremember how it was done. That is why this lesson is dealing with the regrouping process in detail with lots of picture exercises.

After learning regrouping or borrowing, we practice mental subtraction with three lessons. One of them expounds on several methods for mental subtracting. Another is about Euclid's game - a fun game that also practices subtraction.

Better Yet - Package Deals!
Blue Series package - $70 (download) or $75 (CD)
Blue Series for grades 1-3 - $40 (download)
Golden/Green Series package - $65 (download) or $70 (CD)
Light Blue Series package - $89 (download) or $94 (CD)
Blue/Golden/Green Series package - $110 (download) or $115 (CD)
All Inclusive package - $145 (download) or $150 (CD)

Learn more about the package deals!

*BONUS*: Buy any package 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 one of the package deals 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 as downloads at

• Kagi store - all of the ebooks and CDs. Kagi accepts all major credit cards, Paypal, check, cash, money order, purchase order, and a wire transfer. I maintain four different order pages at Kagi:
  • One for the Blue series,
  • another for the Golden and Green Series, and
  • third for the LightBlue 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, checks, Paypal (USD), money orders, 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 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. That's it!

  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 - all Blue, Golden, and Lightblue series books (downloads). Credit cards, Paypal.
• The Old Schoolhouse Store - the Blue Series ebooks. Credit cards, Paypal.
• Lulu - printed copies for the Blue, Golden, and Light Blue series books.
• Winterpromise - printed copies and CDs for the LightBlue series.

All the books are available for *nearly instant download.
*Order processing at Kagi takes 1-2 hours; I do not know how quick it is at the other stores.

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Printed copies

You can buy printed copies of the Blue, Golden, and Light Blue series books at Lulu.com. You can find a links to the printed copy also on each individual book's page (right sidebar).

Winterpromise sells printed copies for the Light Blue series books along with CDs.

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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.