Number composition is different from addition or subtraction in that we are asking children to grasp the structure of a number. For example, the number 5 can be decomposed as 5 and 0 4 and 1 3 and 2.Īctivities such as the one in the opening vignette foster an understanding of quantity and of the relationship between numbers, and they lay the foundation for more complex math concepts to come. To decompose a number is to break that number (whole) into parts to make smaller numbers. What Is Number Composition and Decomposition?Ĭomposing a number is putting together two numbers (two parts) to make a larger number (whole), like joining 2 and 4 to make 6. Sylwia used a game and real-life problems to make this big math idea meaningful for the children. They are engaged in a math experience about composing and decomposing the number 6. Sylwia and the children are not just having fun playing musical hoops. ” “Two.” A child exclaims, “Two and four is six!” ” Children complete her sentence: “Four.” “And the other part has. Th e teacher continues, “Oh, wow! We made another combination of the number six!” She represents this combination on the board using dots and numerals while the children count the dots with her. Sylwia then asks the whole group, “And how many are we all together?” The children call out, “Six!” “Adrian,” Sylwia asks, “what combination did we make this time? How many do we have in each hoop?”Īdrian counts the number of children in his hoop including himself, then counts the other hoop, replying, “Four and two.” Sylwia supports her dual language learners by translating key phrases into Spanish, such as “cuatro y dos.” The music stops, and the teacher and children each step into a hoop. The music starts again, sending the group galloping around once more. This time, they all gather into one hoop. ![]() When Sylwia pauses the music, the children know to scatter and find a spot in one of the two hoops. They sing along to a familiar tune playing in the background. Then you would move them to the whole so show that the two parts make 9.Five preschool children and their teacher, Sylwia, are galloping around two Hula Hoops placed in the center of the rug. If using a number bond, you would put 4 objects in one part, and 5 objects in the other. To compose a number, you take smaller numbers and combine them to make a larger number.Īn example is 4 and 5 makes 9. Here’s a link to a free decomposing numbers worksheet. ![]() ![]() You can play build it and break it, shake and spill, or you can simply give students a number, and they can use a number bond to decompose it. ![]() There are many activities you can use to show decomposition. It’s also visual, so students can see how a number can break into smaller parts. Using a number bond, you can decompose a number in many ways. You put objects in the big circle and move some objects into one circle, called a part, and some into another circle also called a part. A number bond has a big circle and two smaller circles. One math strategy you can use to show decomposition is a number bond. To decompose the number six, you can break it into smaller parts like 5 and 1 or 3 and 3. To decompose a number, you take the whole number and break it down into smaller parts. In this blog post, I will explain what is composing and decomposing numbers.
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