Simple Examples of Decomposing Number 9 with Objects

🔢 Quick Study Guide

• 🍎 Decomposing a number means breaking it down into smaller parts that add up to the original number.
• 🧸 For the number 9, we can use objects to visualize different combinations. For example: 5 toys + 4 toys = 9 toys.
• ➕ We can represent this mathematically using addition. Some possible decompositions of 9 are: $9 = 1 + 8$, $9 = 2 + 7$, $9 = 3 + 6$, $9 = 4 + 5$.
• 🖐️ You can use your fingers! 🖐️ Hold up all ten fingers, then put one down. You now have nine fingers up! You can also hold up five fingers on one hand and four on the other.
• 💡 Each combination shows a different way to 'make' the number 9.

Practice Quiz

1. What is one way to decompose the number 9 using two groups of objects?
   1. 3 objects + 3 objects
   2. 6 objects + 2 objects
   3. 5 objects + 4 objects
   4. 7 objects + 1 object
2. Which equation correctly decomposes the number 9?
   1. $9 = 2 + 6$
   2. $9 = 3 + 5$
   3. $9 = 4 + 4$
   4. $9 = 1 + 8$
3. Imagine you have 9 apples. You give 3 apples to your friend. How many apples do you have left to show one part of the decomposition?
   1. 2 apples
   2. 5 apples
   3. 6 apples
   4. 4 apples
4. You have 2 building blocks. How many more building blocks do you need to have a total of 9?
   1. 6 building blocks
   2. 5 building blocks
   3. 7 building blocks
   4. 8 building blocks
5. Which of the following does NOT decompose 9?
   1. 7 + 2
   2. 3 + 6
   3. 5 + 5
   4. 4 + 5
6. If you have 9 cookies and divide them into two piles, one with 1 cookie, how many cookies are in the other pile?
   1. 7 cookies
   2. 9 cookies
   3. 8 cookies
   4. 6 cookies
7. Which number completes the equation to decompose 9: 9 = 6 + ?
   1. 1
   2. 2
   3. 3
   4. 4