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Math Mammoth Add & Subtract 2-A and 2-B
Two workbooks for grade 2

75 pages
(answers included)
Price: $3.50 PDF download

Buy printed hardcopy
at Lulu - $10.95, b&w

Sample pages (PDF)
Contents & Introduction
Refresh Your Memory
Subtracting One-Digit Numbers
Completing Ten
Going Over the Next Ten
Adding With 8
Subtract to Ten
Fact Families with 13
Some word problems

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72 pages
(answers included)
Price: $4.00 download

Buy at Kagi
(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
Money - Quarters, Dimes, Nickels, Pennies
Review

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Math Mammoth Add & Subtract 2-A

Math Mammoth Add & Subtract 2-A deals with two main themes:

• "easy" addition and subtraction situations within 0-100; such as adding a two-digit number and a single-digit number without completing the next ten, or adding or subtracting whole tens, the concept of difference; and
• memorizing the basic addition facts of single-digit numbers where the answer is between 10 and 18, and learning to use them with subtraction.

The book is fairly self-explanatory and easy for parents to teach with.

Math Mammoth Add & Subtract 2-A starts out with some review of basic addition and subtraction. Then follow lessons about the 'easy' situations where you add a single-digit number to a two-digit number, or subtract a single-digit number from a two-digit number without changing the ten.

Then we study the concept of completing a ten and going over to the next ten. The child adds 8 + 5 by first adding 8 + 2 and then the "leftover" 3. These prepare the child for addition facts where the sum is more than 10.

As to the memorizing work, there are 20 such addition facts to memorize:

9 + 2 till 9 + 9: 8 facts
8 + 3 till 8 + 8: 6 facts
7 + 4 till 7 + 7: 4 facts
6 + 5 till 6 + 6: 2 facts

The lesson Adding with 9 is based on the concept of completing the ten. The idea is that 9 + 5, for example, can be seen as 9 + 1 + 4, where 9 + 1 completes the ten, and so we have 4 left over to go over ten. Here it is important to remember what numbers make up 10, so you can review that if needed.

Adding with 8 practices the addition facts from 8 + 3 till 8 + 8. Similarly, Adding With 7 deals with addition facts from 7 + 4 to 7 + 9, and Adding with 6 is about facts from 6 + 5 and 6 + 9.

Then we reverse the process and practice subtracting. First, the child subtracts TO ten with problems such as 16 − __ = 10. Then come subtraction problems which "cross" the ten the other direction, such as 16 − 7. Again the student first practices these by subtracting in two parts: first subtracting to ten, then the rest. For example, 16 − 7 becomes 16 − 6 − 1.

The various lessons about fact families give lots of practice and further reinforce memorizing the facts.

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

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 lesson Regrouping practices breaking down a ten to ten ones in cases where there aren't enough ones to do the subtraction. Lots of visual exercises help in understanding the regrouping (borrowing) in subtraction.

Lastly we study subtracting a single-digit number from a two-digit number mentally, counting coins (which is a nice application of things learned), and adding 2-digit numbers mentally by breaking them into parts.

Better Yet - Package Deals!
Blue Series package - $90 (download) or $95 (CD)
Blue Series for grades 1-3 - $38 (download)
Blue Series for grades 4-6 - $52 (download)
Golden/Green Series package - $65 (download) or $70 (CD)
Light Blue Series package - $118 (download) or $123 (CD)
All Inclusive package - $177 (download) or $182 (CD)
"Everything" Bundle - $225 (download only)

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*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 at:

• Kagi store - all of the downloads and CDs. I maintain five different order pages at Kagi:
  • One for the Blue series,
  • another for the Golden and Green Series, and
  • third for the Light Blue 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, 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 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.