Math Mammoth Add & Subtract 2-A and 2-B
Two workbooks for grade 2
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.
Package deals!
Blue Series package - $53 (download) or $58 (CD)
Golden/Green Series package - $50 (download) or $55 (CD)
All Inclusive package - $91 (download) or $96 (CD)
LightBlue Series package - $72 (download)
*BONUS* With any package purchase above you will get Soft-Pak software for FREE (includes 4 math, 1 language arts, 2 testing programs).
Learn more Order packages
*BONUS* - FREE MATH SOFTWARE
With any purchase of Math Mammoth books, you will qualify to get Soft-Pak math programs (list price $24.95) for just a small $3.50 s&h fee!
* 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
With any CD purchase or Blue Series download, you will get those above plus 3 programs more, for FREE, included on the CD.
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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.
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