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 Enlarge Quack and CountAuthor: Keith BakerIllustrator: Keith BakerPublisher: Harcourt BraceCopyright: 1999ISBN: 0-15-205025-6Number of Pages: 24Ohio Standards Alignment: Grades preK–1The numberÂ 7 is broken down into all possible sums of two smaller whole numbers. Illustrations of seven baby ducks depict each sum and its reversal (2 + 5 and 5 + 2). Some of the pictures partially "hide" one or two of the ducks, and children will enjoy finding them all.Go to: How to Use This BookHighlights and InsightsRelated ORC ResourcesOhio Standards

 How to Use This Book Working from the illustrations of commutativity of addition, such as (3 + 4) ducklings and (4 +3) ducklings, the teacher could show those rubber ducks in parallel settings and ask: How much is 3 + 4? How about 4 + 3? The number 7 is large enough that more than a few decompositions can be used (6+1, 5+2, 4+3, 1+6, etc.). Lower or higher numbers can be substituted depending on the level of the children. Teachers can use groups of children to show how the group can be divided up into different addends. This book can be used as a precursor to other booksÂ that decompose numbers other than 7 into sums of smaller numbers (books by Greg Tang, for example). To work toward subtraction, play "Hide the Duck" with students. Start with 7 rubber ducks, and as the children close their eyes, hide some of the ducks. Have the children tell how many ducks are hiding after opening their eyes. A way to work up to this book would be to read or sing "5 Little Ducks," a backwards counting story. The rubber ducks can be used here to allow the youngest children to visualize the subtraction of ducks. Domino games or activities where 6 & 1, 5 & 2, or 4 & 3 are used, or other combinations as appropriate.
 Highlights and Insights This book is a simple way to introduce the addition concept to even the youngest students because it uses only one number as the sum. It goes beyond simple rote counting to show how one number can be represented as a combination of other smaller numbers. Besides decomposition of the number 7, which can be generalized, the book also introduces or reinforces the commutative property of addition.