Math Mammoth Add & Subtract 2-A - basic facts within 0-18.

75 pages
(of which 57 are lesson pages)
Price: $4.50 download

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

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

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

• “easy” additions and subtractions 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; 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 starts out with some review of basic addition and subtraction. Then follow lessons that deal with the “easy” situations. Children learn to add a single-digit number to a two-digit number without changing the ten (for example, 23 + 3 or 75 + 4), and to subtract a single-digit number from a two-digit number without changing the ten (for example 96 − 5 or 58 − 6). We also study adding and subtracting whole tens, and the concept of difference.

Next we study the idea of completing ten and going over. For example, the child adds 8 + 5 by first adding 8 + 2 (which makes 10), and then adding the 3 that was “left over”. These lessons prepare the student for the middle part of the book, which has to do with memorizing the basic addition facts.

The middle part of the book practices these 20 single-digit addition facts:

from 9 + 2 till 9 + 9: 8 facts (lesson Adding with 9) from 8 + 3 till 8 + 8: 6 facts (lesson Adding with 8) from 7 + 4 till 7 + 7: 4 facts (lesson Adding with 7) from 6 + 5 till 6 + 6: 2 facts (lesson Adding with 6)

As the lessons proceed, there are fewer and fewer new facts to practice and memorize.

After those, we study subtracting and the concept of difference once again. First, the child subtracts TO ten with problems such as 16 − __ = 10. Then we proceed to subtraction problems in which the answer is less than 10, such as 16 − 7. The student can do these by subtracting in two parts: first subtracting to ten, then subtracting the rest. For example, 16 − 7 can be thought of as 16 − 6 − 1.

Lastly, the various lessons about fact families and number rainbows are intended to give lots of practice and reinforcement for memorizing the addition and subtraction facts. These lessons emphasize using the connection between addition and subtraction to solve subtraction problems such as 13 − 8 or 15 − 6.

The video below shows several of the strategies for learning addition and subtraction facts that are used in the book:

Learning addition & subtraction facts

Testimonials

I have a 2nd grade daughter who just "didn't get" math. We've been using another well known math program which was just moving too fast for her. Fortunately, I had purchased Mammoth Math [Add & Subtract] 2A over the summer and it has turned her into an "I get it" kid! We just completed 2A and will be starting 2B shortly. It's been an awesome supplement and my daughter looks forward to her daily math worksheets!
I can't believe how much more confident she's become in her computation skills and she's even soaring with the story problems. Thanks Mammoth Math!
1 December 2008

The following is one of the winning entries to Math Mammoth 2008 Thanksgiving Contest.

Tomorrow we will finish the final two pages in your Blue Addition/Subtraction 2-A. My 10 yo daughter, Gracie, has Autism, and nearly every math we have tried so far has been a impassable trial for her. I really didn't know what to do anymore! Our family has been homeschooling since 1993, and Gracie is our third child, but she has difficulties that our other two simply did not have. I remembered your website from previous web searches, and after reading about your Light Blue series, a light bulb went on! Why not address her individual math skill needs instead of trying to tackle a whole curriculum again? With each of your books costing only a few dollars, there was no risk at all! I ordered the Blue Addition/Subtraction 2- A, downloaded, and printed that very day.

Well, it turned out to be just what Gracie needed! You teach math topics efficiently and interestingly, with no extraneous fussiness. After doing a few weeks of your math (slowly - 2 pages per day) Gracie asked to know a bit more about the writer. We went online so she could read your "about" page, and was so pleased to put a name and face to your math books. You see, she discovered that you like patterns, and believes you hide patterns all through your math worksheets. In fact, she now notices lots of math patterns quickly, and makes extra effort with her math worksheets to make sure Mrs. Miller doesn't "trick" her. Her ability to see patterns makes learning math facts so much easier. It never occurred to me (or my Engineer husband) to explain math the way you do. You seem to be speaking her "math language" and - finally - math makes sense to her.

Today, I'll be ordering the Blue A/S 2-B, so we can carry on with Gracie's math seamlessly. I'm so thankful you wrote this particular (Blue) series. I'm sure most homeschoolers order the Light Blue Full Curriculum, and I hope it's a good fit for them. But, there are students (perhaps with Special Needs, or just with Math Phobia) who just can't manage a full curriculum. I hope they'll consider the Blue series, which attacks math skills individually, in a way which builds skill-upon-skill, and teaches little patterns and tricks in a very do- able (and reasonably priced!) format.

Cheers,
Lauri Bolland (and Gracie)

Thank you so much for new edition of the Add/Subtract 2a book!! I gave the new pages as homework tonight and am amazed to see the excitement the rainbows have created working with inverse operations/fact families. Thank you, again! I love incorporating your worksheets into our lessons it has made my children confident independent workers! Your newsletters and blogs are so worth the read!! The information you have and receive about math is making a tremendous difference in my home everyday!! Your consideration, work, time, and effort is greatly appreciated by my family.

Shai Hawk

The followup to this book is Add & Subtract 2-B, which practices adding and subtracting two-digit numbers mentally and in columns (carrying and borrowing).

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 - $99 (download) or $104 (CD)
Blue/Golden/Green Series package - $110 (download) or $115 (CD)
All Inclusive package - $150 (download) or $155 (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 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).
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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.
• The Old Schoolhouse Store carries the Blue Series books as downloads. Credit cards, Paypal.
• 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).
• Winterpromise sells printed copies and CDs for the Light Blue series grades 1-4.

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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.