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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 softcopy
at Lulu - $11.05, b&w

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

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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.

The video below shows a similar idea as to what is in the book about regrouping (borrowing).

Subtraction with regrouping (YouTube video)

Better Yet - Package Deals!
Blue Series package - $90 (download) or $95 (CD)
Blue Series for grades 1-3 - $38 (download)
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*BONUS* - SOFT-PAK MATH SOFTWARE

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* Math Maker, for printable math activities with answer keys
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* 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 at:

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  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 Lightblue 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 has printed copies for the Blue, Golden, and Light Blue series books. For each book at MathMammoth.com, you can find a link to the printed copy sold at Lulu on each individual book's page (right sidebar).

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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.