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Learn to carry and borrow with pictures! Self-teaching printable math workbook for grade 2. |
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You are here: Home → Blue Series → Add & Subtract 2-B Math Mammoth Add & Subtract 2-B - within 0-100. 78 pages (includes answers) 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 Prices & orderingPDF download $4.25 (credit cards, Paypal, check, cash, PO, wire transfer, money order; Kagi shopper help)
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Printed copy $8.40, b&w (credit cards, Paypal, PO)
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November 2011 - the PDF version of this book is now enabled for annotation! 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).
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